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, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 128, 129, 130
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Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
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.
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,and 97 are all prime numbers. The rest are composite