Q: Is 28,125 a Prime Number?

A: No, 28,125 is not a prime number.

Why is 28,125 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 28125 can be evenly divided by 1 3 5 9 15 25 45 75 125 225 375 625 1,125 1,875 3,125 5,625 9,375 and 28,125, with no remainder.

Since 28,125 cannot be divided by just 1 and 28,125, it is not a prime number.

Number	28,123	28,124	28,126	28,127
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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