Any number with more than 2 factors is composite.
12 has six factors, so it's composite.
18 also has six factors, so it's composite too.
(Only 4 of the factors of 8 are the same as 4 of the factors of 12)
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5 and 37 are prime. 12 and 18 are composite.
The first 12 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, and 21.
12, 14, 15, 16.
The composite factors of 72 are 4, 6, 8, 9, 12, 18, 24, 36, 72
composite numbers between 11 and 21:12 14 15 16 18