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A prime number is a whole number which has exactly two factors: 1 and itself.
Examples:
7 is prime, because it has exactly two factors: 1 and 7.
6 is not prime, because it has more than two factors: 1,2,3,6.
3.84 is not prime, because it’s not whole.
-7 is not prime, because it’s not whole.
Related:
Why 0 is not prime?
Why 1 is not prime?
Keywords:
prime number
prime numbers
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