Prime and Composite Numbers Worksheet
Identify and classify numbers as prime or composite, and find factors for numbers up to 100.
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Prime and Composite Numbers
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Read each question carefully and follow the instructions to determine if a number is prime or composite. Remember, a prime number has exactly two factors (1 and itself), and a composite number has more than two factors.
1. Which of the following is a prime number?
9
15
23
27
2. Which of the following is a composite number?
11
13
17
21
3. A prime number has exactly factors.
4. A composite number has than two factors.
5. The number is neither prime nor composite.
6. The number 2 is the only even prime number.
True
False
7. All odd numbers are prime numbers.
True
False
8. List all the factors of 12. Is 12 a prime or composite number? Explain your answer.
9. List the first five prime numbers.
For each number, write 'Prime' or 'Composite' in the blank.
10. 19:
11. 25:
12. 31:
13. 39:
14. 47:
15. 51:
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