31 is a Prime number because it has only two factors which are itself and one
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It is composite because it has more than two factors
31 is prime.
31 is a prime number. 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.
31 is a prime number because it is only divisible by 1 and itself.
The number 1 is neither a prime nor a composite number.