61 is prime because it is only divisible by 1 and 61 (aka itself).
Prime numbers are numbers that are only divisible by 1 and itself. Their only factors are 1 and itself. This is the case with 61.
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61 is prime.
61 is already prime.
51 composite, 61 prime.
61 is a prime number
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.