3 is a factor of 42 but 3 is a Prime number
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Composite. 42 = 2 * 3 * 7
42 is a composite number as it is divisible by 1, 2, 3, 6, 7, 14, 21 and 42.
DEFINITELY Composite. Reason ; it is an even number, which means it will divide by '2' , hence it is composite. It is compoed by 2 x 21 = 42 or 3 x 14 = 42 or 6 x 7 = 42 NB ANY EVEN Number, except '2', is composite, there by NOT a PRIME Number.
42 is a composite number because it has at least one positive factor other than one or itself. The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.
42 and 52 are composite.