Lesson 3: Prime and Composite Numbers — Practice Questions

1. 1. Which statement best explains why the number 52 is a composite number?

   • A. It is an even number greater than 2.
   • B. The sum of its digits is 7.
   • C. It ends in the digit 2.
   • D. It is greater than 50.

2. 2. What is the smallest even composite number? ___

3. 3. The number 88 is an even number greater than 2. Is this number prime or composite?

   • A. Prime
   • B. Composite

4. 4. The number 46 is an even number, so it is a multiple of 2. Because it is greater than 2, it must be composite. What is its smallest prime factor? ___

5. 5. Which of the following numbers is the only even prime number?

   • A. 14
   • B. 4
   • C. 2
   • D. 10

6. 6. Which of the following best describes the number 13?

   • A. It is a prime number.
   • B. It is a composite number.
   • C. It is neither prime nor composite.
   • D. It is both prime and composite.

7. 7. A composite number is a whole number with more than two factors. The number 9 is composite. How many factors does it have? ___

8. 8. According to the definitions of prime and composite numbers, how is the whole number 1 classified?

   • A. Prime
   • B. Composite
   • C. Neither prime nor composite
   • D. Both prime and composite

9. 9. Which of the following numbers is a composite number?

   • A. 2
   • B. 7
   • C. 15
   • D. 17

10. 10. A prime number is a whole number greater than 1 that has exactly how many factors? ___