24 is divisible by 2 and 35 is divisible by 5. 31 has only two factors: 1 and itself. 31 is the Prime number.
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31 is a prime number, but 24 and 35 are not.
23 29 31.
23, 29 and 31
17 19 23 29 31
The primes are 23, 29, and 31.