3 x 3 x 3 x 3 = 81
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3,
Just 3.
Yes.
They are: 83, 89 and 97
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. 81 is composite, 111 is prime.