Explanation:
Hey there!
23 is a prime number.
Reason:
Prime number are those numbers which are divisible by 1 and itself.
Example: 5 is divisible by 1 and 5 only. so, it is a prime number.
Composite numbers are those numbers which are divisible by more number.
Example: 6 is divisible by 1,2,3,6 so, it is a composite number as it is divisible by others number expect 1 and itself.
Hope it helps...