ANSWER: 61 is a prime number but 51 is a composite number.
61 is a Prime number because the factors of 61 are 1 and itself (61).
51 is a composite number because the factors of 51 other 1 and itself (51) are 3 and 17.
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51 is a composite number but 61 is a prime number
51 = 3x17
33 = 3 x 11 51 = 3 x 17 41 prime 61 prime
3 x 17 = 51. It has factors other than 1 and itself. It is composite. 61 is prime. Its only factors are 1 and 61. 71 is prime. Its only factors are 1 and 71. 7 x 13 = 91. It is a composite number.
61 is prime.