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Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
no all even numbers except 2
All square numbers greater than 1 are composite.
4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35
Do a quick search on the Web to get a list of prime numbers; all numbers greater than 1 that are not prime are composite. (That is, 0 and 1 should not be listed as "prime numbers", nor as "composite numbers".) Composite numbers are numbers that have at least three factors. A composite number can be divided evenly by 1, itself, and another number. From zero to fifty, they are 2,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39,40,42,45,46,48, and 49.