Applying Prime Number Knowledge

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| By Thames
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Thames
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Quizzes Created: 7288 | Total Attempts: 9,526,295
| Questions: 20 | Updated: Nov 26, 2025
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1) Which of these numbers is composite?

Explanation

The number 39 is composite because 39 = 3 × 13.

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About This Quiz
Applying Prime Number Knowledge - Quiz

Now it’s your turn to put prime numbers to work! In this quiz, you’ll apply what you know to trickier problems—testing prime factorizations, finding large prime numbers, and showing off your prime-spotting skills. Take this quiz and prove how well you really know your primes!

2) Which prime factorization is correct for 24?

Explanation

The prime factorization of 24 is 2 × 2 × 2 × 3.

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3) Which number is the largest prime under 100?

Explanation

The largest prime number under 100 is 97.

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4) Which is prime?

Explanation

The number 89 is prime because its only factors are 1 and 89.

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5) Which two numbers are prime?

Explanation

Both 41 and 43 are prime numbers.

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6) What is the prime factorization of 32?

Explanation

The prime factorization of 32 is 2 × 2 × 2 × 2 × 2.

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7) Which of the following is prime?

Explanation

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

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8) Which number is not prime?

Explanation

The number 105 is not prime because 105 = 3 × 5 × 7.

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9) Which is a composite number?

Explanation

The number 121 is composite because 121 = 11 × 11.

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10) Which is the correct prime factorization of 45?

Explanation

The prime factorization of 45 is 3 × 3 × 5.

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11) Which of these numbers is not prime?
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12) Which prime factorization is correct for 100?

Explanation

The prime factorization of 100 is 2 × 2 × 5 × 5.

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13) Which number is prime?

Explanation

The number 149 is prime because its only factors are 1 and 149.

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14) Which number is prime?

Explanation

The number 41 is prime because its only factors are 1 and 41.

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15) Which numbers are prime?

Explanation

These numbers are prime because each has only two factors.

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16) Which number is composite?

Explanation

The number 63 is composite because 63 = 7 × 9.

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17) Which of the following is prime?

Explanation

173 is prime because it has only two factors: 1 and 173.

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18) Which of the following numbers is prime?

Explanation

The number 127 is prime because its only factors are 1 and 127.

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19) Which number is prime?

Explanation

The number 109 is prime because its only factors are 1 and 109.

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20) Which of these numbers is composite?

Explanation

The number 161 is composite because 161 = 7 × 23./

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Which of these numbers is composite?
Which prime factorization is correct for 24?
Which number is the largest prime under 100?
Which is prime?
Which two numbers are prime?
What is the prime factorization of 32?
Which of the following is prime?
Which number is not prime?
Which is a composite number?
Which is the correct prime factorization of 45?
Which of these numbers is not prime?
Which prime factorization is correct for 100?
Which number is prime?
Which number is prime?
Which numbers are prime?
Which number is composite?
Which of the following is prime?
Which of the following numbers is prime?
Which number is prime?
Which of these numbers is composite?
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