They are: 4 6 8 9 10 12 14 15 16 and 18 because each of them has more than 2 factors
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Whatever isn't prime: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
Prime numbers have two factors. Composite have more than two. Neither (one and zero) have less than two.
Prime numbers have two factors. Composite numbers have more than two.
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They are both composite numbers because they have more than two factors