Q: Is 691,431 a Prime Number?
A: No, 691,431 is 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 691431 can be evenly divided by 1 3 13 39 17,729 53,187 230,477 and 691,431, with no remainder.
Since 691,431 cannot be divided by just 1 and 691,431, it is not a prime number.