Q: Is 628,591 a Prime Number?
A: Yes, 628,591 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 628591 can be evenly divided by 1 and 628,591, with no remainder.
Since 628,591 can be divided by just 1 and 628,591, it is a prime number.