Identifying Prime Numbers

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Thames
T
Thames
Community Contributor
Quizzes Created: 7288 | Total Attempts: 9,526,295
| Questions: 20 | Updated: Nov 26, 2025
Please wait...
Question 1 / 20
0 %
0/100
Score 0/100
1) Which of these pairs are both prime?

Explanation

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

Submit
Please wait...
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

2) Which number is a prime less than 20?

Explanation

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

Submit
3) Which of these is the set of prime numbers?

Explanation

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

Submit
4) 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.

Submit
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.

Submit
6) Is 23 prime or composite?

Explanation

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

Submit
7) Which number is prime?

Explanation

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

Submit
8) Which number is composite?

Explanation

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

Submit
9) What is the prime factorization of 20?

Explanation

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

Submit
10) Which number is not prime?

Explanation

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

Submit
11) 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.

Submit
12) 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.

Submit
13) The number 1 is:

Explanation

By definition, 1 is not considered prime or composite.

Submit
14) Prime factorization of 36 is:

Explanation

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

Submit
15) Which is true about 97?

Explanation

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

Submit
16) The next prime after 43 is:

Explanation

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

Submit
17) How many factors does 7 have?

Explanation

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

Submit
18) How many prime factors does 30 have?

Explanation

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

Submit
19) 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.

Submit
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.

Submit
×
Saved
Thank you for your feedback!
20)
Your input helps us improve, and you’ll get your detailed results next.
View My Results
Cancel
  • All
    All (20)
  • Unanswered
    Unanswered ()
  • Answered
    Answered ()
Which of these pairs are both prime?
Which number is a prime less than 20?
Which of these is the set of prime numbers?
Which number is composite?
Which statement is true?
Is 23 prime or composite?
Which number is prime?
Which number is composite?
What is the prime factorization of 20?
Which number is not prime?
Which of the following is a prime number?
What is the smallest prime number?
The number 1 is:
Prime factorization of 36 is:
Which is true about 97?
The next prime after 43 is:
How many factors does 7 have?
How many prime factors does 30 have?
Which of these numbers has exactly two factors?
Which of the following is a prime number?
Alert!

Advertisement