42 has three prime factors: 2, 3 and 7
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23 and 19
19 and 23
37 and 5
37 + 5 31 + 11
No, 7 and 42 are not prime numbers. 7 is a prime number because it only has two distinct positive divisors, 1 and 7. 42 is not a prime number because it has more than two distinct positive divisors, including 1, 2, 3, 6, 7, 14, 21, and 42.