Yes.
21 is not a prime number.
no the only even number that is composite is two
Yes.
No 23 is a prime #
composite. 123 = 3 * 41
One (1) is not a composite number.
A prime number is a number that is only divisible by one and itself. For example, the number five is a prime number, but its multiples are not because they are divisible by five. The prime numbers from one to twenty are 2, 3, 5, 7, 11, 13, 17, and 19. A composite number is the opposite of a prime number. A composite number can be divided by more numbers than just one and itself. The composite numbers from one to twenty are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, and 20. ~Jessica.Songbird
Your options C and D are the same, but it is true that 51 is a composite number.
It is composite.
24 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
20 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
ANSWER: One is not a composite number.One is not also a prime number.