Q: Is 172,420 a Prime Number?

A: No, 172,420 is not a prime number.

Why is 172,420 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 172420 can be evenly divided by 1 2 4 5 10 20 37 74 148 185 233 370 466 740 932 1,165 2,330 4,660 8,621 17,242 34,484 43,105 86,210 and 172,420, with no remainder.

Since 172,420 cannot be divided by just 1 and 172,420, it is not a prime number.

Number	172,418	172,419	172,421	172,422
Prime?	no	no	yes	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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