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## Sagot :

A.

7 - is a prime number

17 - is a prime number

63 - is not a prime number because 63 = 3 × 21

**B.**

**3 - is a prime number**

**11 - is a prime number**

**23 - is a prime number**

**31 - is a prime number**

C.

1 - is not a prime number

D.

2 - is a prime number

3 - is a prime number

5 - is a prime number

15 - is not a prime number because 15 = 3 × 5