prime numbers are numbers that can be divide by themselves and 1. composites are numbers that can be divided by other numbers. So whatever is not a prime number, is a composite number. Try and see which one it is by using a calculator and dividing it by small numbers (1,2,3,5,7,11, etc.). There are a few tricks. If it ends in an even number (0, 2, 4, 6, or 8) then it is NOT a prime number. Same goes with numbers ending with a 5 or 0 (they are always divisible by a 5). Here's a neat one: And if all the digits add up to a number divisible by 3, then it is also not a prime number. Ex: 291= 2+9+1=12.12 is divisible by 3, therefore the number 291 is NOT a prime number (it is divisible by 3 and 97). So, you tell me, which one of those numbers are prime?