351 is a composite number. This is because composite numbers are any number that has more than two factors (one and itself). Therefore, since there are many factors of 351 besides one and itself such as 3, 9, and 13, that makes it a composite number.
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The number is not COMPOSITE. Instead, it is a prime number.
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.