Q: Is 671,691 a Prime Number?
A: No, 671,691 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 671691 can be evenly divided by 1 3 181 543 1,237 3,711 223,897 and 671,691, with no remainder.
Since 671,691 cannot be divided by just 1 and 671,691, it is not a prime number.