810 is composite, as are all even numbers greater than 2.
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It is a composite number because it has at least one positive factor other than one or itself.
All even numbers greater than two are composite.
810
No. 810 is even, and thus divisible by 2. That makes it non-prime, or composite. It also has other factors, such as 3 and 5, still making it non-prime.
4, composite. 67, prime.
Prime