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Anonymous
67 is a Prime number, but 21 isn't.
A prime number can only be evenly divided by '1' and itself.
21 can be evenly divided by 1, 3, 7, and 21.
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Yes 17 and 67 are prime numbers.
59 and 67 are prime numbers.
No, just 67.
19 and 67 are prime numbers.
Prime, composite, prime.