Seven is prime because the only factor for seven is one and itself ,so thats wat makes it prime.
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No, it is composite.
Yes.
No. 5 and 7 are both prime numbers.
4, composite. 67, prime.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 47 is prime.