7 is a Prime number because it's factors are itself and one.
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91 is the only composite factor of 91. 7 and 13 are prime.
composite
The prime factorization of 63 is 3 x 3 x 7.
7 is prime and 8 is composite
Composite because '7' is a factor of 1519 7)1519 = 217 Divide by '7' again 7)217 = 31 Divide by '31' ( a prime Number) / 31 = 1 So 1519 is a composite of 7 x 7 x 31 or 49 x 31