No, it is not a prime number. It has factors of: 1, 3, 17, 51.
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61 is a prime number. 49 is not a prime number as it is divisible by 7. 51 is not a prime number as it is divisible by 3.
51 is not a prime number: 3x17=51
47, yes. 51, no.
51 is composite.
51 is not prime (17 x 3)