Questions on Prime and Composite Numbers
Multiple choice questions on Prime and Composite Numbers for Grade 6, each with five alternatives (A–E) and based on hypothetical real-life situations. Explanations follow the answer key at the end.
Prime and Composite Numbers – Grade 6
Questions:
1. Emma is organizing a party and wants to arrange 17 balloons in equal groups. She finds that she can’t divide them evenly. What type of number is 17?
A) Even
B) Composite
C) Odd
D) Prime
E) Rational
2. A class of 23 students wants to split into equal teams larger than 1. They can’t. What is 23?
A) Composite
B) Prime
C) Multiple
D) Square
E) Factor
3. A baker has 28 cookies and wants to pack them equally in boxes. Since it's possible to divide them evenly into several groups, what kind of number is 28?
A) Prime
B) Even
C) Composite
D) Odd
E) Square
4. Which number is not a prime number?
A) 2
B) 3
C) 11
D) 15
E) 17
5. A gardener plants 37 flowers in a single row and can’t divide them into smaller rows with equal flowers. What is 37?
A) Composite
B) Square
C) Even
D) Prime
E) Multiple
6. A game uses numbered cards from 1 to 50. Which number on a card is composite?
A) 1
B) 2
C) 3
D) 4
E) 5
7. Which of the following numbers is a composite number?
A) 5
B) 7
C) 9
D) 3
E) 11
8. During a quiz game, Ava picked a card with the number 1. Her teacher said 1 is:
A) Prime
B) Composite
C) Prime and composite
D) Neither prime nor composite
E) Even
9. What is the smallest prime number?
A) 0
B) 1
C) 2
D) 3
E) 4
10. A school has 45 lockers, and the principal wants to label them using only prime numbers. Which of the following numbers would not be used?
A) 2
B) 3
C) 5
D) 7
E) 9
11. Leo is building shelves and wants to make 10 shelves with the same number of books. Since he can divide the total number of books evenly, is 10:
A) Prime
B) Composite
C) Square
D) Prime and even
E) Prime and odd
12. Which of the following prime numbers is also even?
A) 3
B) 2
C) 5
D) 7
E) 11
13. Which of these numbers is neither prime nor composite?
A) 0
B) 2
C) 3
D) 5
E) 4
14. A total of 16 oranges are placed in equal rows on a table. Since they can be divided into equal rows, what is 16?
A) Prime
B) Composite
C) Neither
D) Odd
E) Prime and even
15. If you write all the prime numbers less than 20, how many will there be?
A) 5
B) 6
C) 7
D) 8
E) 9
16. Which of the following is a prime number greater than 20?
A) 21
B) 25
C) 27
D) 29
E) 30
17. A fruit vendor stacks 33 apples in 3 rows of 11. Is 33 a prime or composite number?
A) Prime
B) Composite
C) Neither
D) Even
E) Can’t be determined
18. Which list contains only prime numbers?
A) 2, 4, 6
B) 3, 5, 7
C) 1, 3, 6
D) 5, 9, 11
E) 2, 8, 10
19. In a math challenge, students were asked to circle all the composite numbers under 10. Which should be included?
A) 2, 3
B) 4, 5
C) 4, 6, 8, 9
D) 1, 3, 5
E) 2, 6, 7
20. Which statement is true?
A) All even numbers are prime
B) All odd numbers are composite
C) 2 is the only even prime number
D) 1 is a prime number
E) 0 is a prime number
Answer Key with Explanations:
1. D) Prime
→ 17 has only 1 and 17 as factors.
2. B) Prime
→ 23 has no divisors other than 1 and itself.
3. C) Composite
→ 28 = 1×28, 2×14, 4×7 → more than two factors.
4. D) 15
→ 15 = 3×5 → composite.
5. D) Prime
→ Only divisible by 1 and 37.
6. D) 4
→ 4 = 2×2 → composite.
7. C) 9
→ 9 = 3×3 → composite.
8. D) Neither prime nor composite
→ 1 is special: not prime nor composite.
9. C) 2
→ First and only even prime number.
10. E) 9
→ 9 = 3×3 → not prime.
11. B) Composite
→ 10 = 1, 2, 5, 10 → more than two factors.
12. B) 2
→ Only even prime number.
13. A) 0
→ Not prime nor composite.
14. B) Composite
→ 16 = 1×16, 2×8, 4×4.
15. D) 8
→ Prime numbers under 20: 2, 3, 5, 7, 11, 13, 17, 19.
16. D) 29
→ 29 has no divisors other than 1 and itself.
17. B) Composite
→ 33 = 3×11.
18. B) 3, 5, 7
→ All are prime.
19. C) 4, 6, 8, 9
→ All have more than two factors.
20. C) 2 is the only even prime number
→ All other even numbers are divisible by 2.
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