Q: Is 671,591 a Prime Number?
A: Yes, 671,591 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 671591 can be evenly divided by 1 and 671,591, with no remainder.
Since 671,591 can be divided by just 1 and 671,591, it is a prime number.