The first 12 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, and 21.
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The first 6 composite numbers are 4, 6, 8, 9, 10, and 12.
The first eight composite numbers are 4, 6, 8, 9, 10, 12, 14, and 15.
The first 15 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, and 25.
12
12 is even, that is 2 divides 12 so 12 cannot be prime.12 is composite. (all even numbers greater than 2 are composite)