117 is a composite number, not a prime. Its factors are 1, 3, 9, 13, 39, and 117. Any number greater than 3 whose digits add up to 3, or a multiple of 3, is a composite number. 1 + 1 + 7 = 9, a multiple of 3.
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17 is a prime number.
Yep.
90 is composite, 117 is prime.
a prime factor
No, it is not a prime number. 117 can be divided evenly. 117 divided by 9 is 13.