61 is already prime.
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31 and 61 are prime numbers. The prime numbers between 31 and 61 are 37, 41, 43, 47, 53, and 59.
1, 61 (61 is a prime number).
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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.
1 and 61 because 61 is a prime number.