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135 is not prime. 135 = 3 * 3 * 3 * 5
135 is a composite number because its factors are:

1x135

3x45

5x27

9x15

1, 3, 5, 9, 15, 27, 45, and 135.

*NOTE: All numbers that have a 0 or a 5 in it are composite, except 5 because they will always have a third factor, 5.

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