Q: Is 604,391 a Prime Number?
A: No, 604,391 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 604391 can be evenly divided by 1 599 1,009 and 604,391, with no remainder.
Since 604,391 cannot be divided by just 1 and 604,391, it is not a prime number.