Identifying Prime Numbers

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1) Which of the following is a prime number?

Explanation

Prime numbers have only two factors: 1 and themselves.

11 is prime, while 9 = 3×3, 15 = 3×5, and 21 = 3×7 are composite.

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About This Quiz
Identifying Prime Numbers - Quiz

Are you ready to test your skills with the most important numbers in math—primes? In this quiz, you’ll practice telling the difference between prime and composite numbers, figure out which ones have only two factors, and spot primes up to 100. Take this quiz and see how sharp your numbe... see moresense really is! see less

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2) What is the smallest prime number?

Explanation

The number 1 is not prime, and 0 is not prime. The smallest prime is 2, which is also the only even prime.

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3) Which number is composite?

Explanation

12 has many factors (1, 2, 3, 4, 6, 12), so it is composite. 13, 17, and 19 are prime.

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4) How many factors does 7 have?

Explanation

7 has exactly 2 factors: 1 and 7. That makes it prime.

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5) Which statement is true?

Explanation

The only even prime is 2. Most odd numbers are not prime (like 9, 15). Also, 1 is neither prime nor composite.

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6) Is 23 prime or composite?

Explanation

23 has only two factors (1 and 23), so it is prime.

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7) What is the prime factorization of 20?

Explanation

Breaking down 20 into primes: 20 = 2 × 2 × 5. That’s the prime factorization.

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8) Which number is prime?

Explanation

29 is prime because its only factors are 1 and 29. 21, 25, and 33 are composite.

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9) Which of these pairs are both prime?

Explanation

17 and 19 are both primes. The other pairs contain composite numbers.

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10) The number 1 is:

Explanation

By definition, 1 is not considered prime or composite.

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11) Which of these numbers has exactly two factors?

Explanation

13 has only two factors (1 and 13), so it is prime. The others have more factors.

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12) The next prime after 43 is:

Explanation

44, 45, and 46 are composite. The next prime is 47.

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13) Which number is not prime?

Explanation

33 = 3 × 11, so it is composite. The others are prime.

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14) Prime factorization of 36 is:

Explanation

36 = 2 × 2 × 3 × 3. Only this option shows prime factors.

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15) How many prime factors does 30 have?

Explanation

30 = 2 × 3 × 5. It has 3 prime factors.

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16) Which is true about 97?

Explanation

97 is prime because its only factors are 1 and 97.

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17) Which number is a prime less than 20?

Explanation

19 is prime. 18, 20, and 21 are composite.

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18) Which number is composite?

Explanation

45 = 3 × 15, so it is composite. The others are prime.

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19) Which of these is the set of prime numbers?

Explanation

The only set that contains only primes is {2, 3, 5, 7}.

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20) Which of the following is a prime number?

Explanation

59 has only two factors (1 and 59), so it is prime. The others are composite.

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Which of the following is a prime number?
What is the smallest prime number?
Which number is composite?
How many factors does 7 have?
Which statement is true?
Is 23 prime or composite?
What is the prime factorization of 20?
Which number is prime?
Which of these pairs are both prime?
The number 1 is:
Which of these numbers has exactly two factors?
The next prime after 43 is:
Which number is not prime?
Prime factorization of 36 is:
How many prime factors does 30 have?
Which is true about 97?
Which number is a prime less than 20?
Which number is composite?
Which of these is the set of prime numbers?
Which of the following is a prime number?
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