Because it has more than two factors. All even numbers, besides the number 2, are composite.
28 is composite.
Composite, yes.
Prime.
47 is a prime number.
5 is a prime number.
29 is a prime number.
91 is composite.
67 is a prime number.
25 is a Composite Number.
because it is 1
89 is a prime number.
6 is a composite number, since its factor are 1,2,3.