Question

is 27 a prime or composite

Answer 1

Prime numbers are numbers that can only be factored by one and itself. Since 27 has factors: 1,3,9, and 27, it is a composite number 
:)

Answer 2

Prime numbers are only divisible by that number and 1. 27 is divisible by 27 and 1, but it is also by 3 and 9 so it is composite.