Q: Is 25,821 a Prime Number?

A: No, 25,821 is not a prime number.

Why is 25,821 not a prime number?

A prime number is a natural number, greater than one, that can only be divided by 1 and itself.

The number 25821 can be evenly divided by 1 3 9 19 57 151 171 453 1,359 2,869 8,607 and 25,821, with no remainder.

Since 25,821 cannot be divided by just 1 and 25,821, it is not a prime number.

Number	25,819	25,820	25,822	25,823
Prime?	yes	no	no	no

All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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