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1. What is a prime number?
A. A number with only two factors
B. A number with more than two factors
C. A number divisible by 3
D. A number divisible by 5
2. Which of the following is a prime number?
A. 8
B. 12
C. 7
D. 15
3. Which of the following numbers is composite?
A. 5
B. 11
C. 9
D. 19
4. What is the prime factorization of 18?
A. 2 × 3 × 3
B. 2 × 2 × 3
C. 2 × 9
D. 3 × 6
5. Which number is a perfect square and also a composite number?
A. 2
B. 5
C. 9
D. 13
6. What is the prime factorization of 36?
A. 2 × 18
B. 3 × 12
C. 2 × 2 × 3 × 3
D. 2 × 3 × 6
7. Which of the following numbers are co-prime?
A. 18 and 35
B. 16 and 24
C. 30 and 45
D. 21 and 49
8. What is the smallest prime number?
A. 1
B. 2
C. 3
D. 5
9. Which of these numbers is neither prime nor composite?
A. 0
B. 1
C. 7
D. 6
10. Which of the following is a common multiple of 3 and 5?
A. 6
B. 9
C. 15
D. 12
11. What is the smallest prime number greater than 10?
A. 11
B. 13
C. 14
D. 12
12. What is the largest prime number less than 50?
A. 47
B. 43
C. 45
D. 41
13. What is the prime factorization of 72?
A. 2 × 2 × 3 × 2 × 3
B. 6 × 12
C. 8 × 9
D. 2 × 36
14. Which of the following is not a prime number?
A. 17
B. 19
C. 21
D. 23
15. Which is the first even prime number?
A. 2
B. 4
C. 6
D. 8
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