No.
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31 is prime. 32 and 33 are composite.
31 is prime.
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
63 is composite.
31 is prime.