Prime numbers
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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.
257 is a prime number. It is only divisible by 1 and itself.
No. It is a prime number and is only divisible by 1 and itself.
103 is a prime number; it is only divisible by 1 and itself.
113 is a prime number. It is divisible only by 1 and itself.