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.
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37 is a prime number but 42 is a composite number
Composite. 42 = 2 * 3 * 7
42 is a Composite Number.
42 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
3 is a factor of 42 but 3 is a prime number