357 is not a Prime number. Its positive integer factors are:
1, 3, 7, 17, 21, 51, 119, 357
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Yes, 357 is a composite number. Its prime factorisation is 3 x 7 x 17.
357 = 3*7*17
composite 3 and 119 7 and 51 17 and 21
357 = 3 x 7 x 17
They are: 354, 355, 356, 357 and 358 Note: 353 is not included because it is a prime number