Q: Is 72,171 a Prime Number?

A: No, 72,171 is not a prime number.

Why is 72,171 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 72171 can be evenly divided by 1 3 9 11 27 33 81 99 243 297 729 891 2,187 2,673 6,561 8,019 24,057 and 72,171, with no remainder.

Since 72,171 cannot be divided by just 1 and 72,171, it is not a prime number.

Number	72,169	72,170	72,172	72,173
Prime?	yes	no	no	yes

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

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