It has more than two factors.
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84 is composite because it factors are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28,42, 84
84 is a composite number because it has multiple factors other than 1 and itself. In fact, the factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84.
42 and 84
The composite factors of 84 are: 4, 6, 12, 14, 21, 28, 42, 84.
84 is not a prime. All numbers ending in four are composite.