No, 56 is not prime.
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The prime numbers (factors) of 56 are: 2 and 7
56 = 2 * 2 * 2 * 7 = 23 * 7
2 and 7 are the prime factors of 56.
Factors are 23 and 7. Prime Factros:2 and 7
56 = 2^3*7 so the only odd factors (apart of 1) is 7.