yes, 331 is a Prime number. can you divide it by anything except for 1 and 331? no, and that is how you know it is prime.
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The number is not COMPOSITE. Instead, it is a prime number.
Yes
Composite (the only even number that is prime is2).
Composite
It is 1 that is neither a prime or a composite number The number 1 is neither prime nor composite.