Q: Is 671,605 a Prime Number?
A: No, 671,605 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 671605 can be evenly divided by 1 5 11 55 12,211 61,055 134,321 and 671,605, with no remainder.
Since 671,605 cannot be divided by just 1 and 671,605, it is not a prime number.