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.
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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.
3 is a factor of 42 but 3 is a prime number
37 is a prime number, so since 42 can not be divided by 37 evenly, they are indeed relatively prime.