Yes, 28 is composite.
Composite
composite
Prime.
composite
prime
No, it's a prime number
73 is a Prime Number
87 is a composite number made up of the primes 3 and 29.
420 is a composite, as are ALL even numbers - with the exception of the number 2.
a comsite number between 40 and 50 is 49:)
18 is multiple of 3 so 18 can be factored as 18=2*3*3
10 and 3 8 and 5 7 and 6