Q: Is 685,609 a Prime Number?
A: Yes, 685,609 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 685609 can be evenly divided by 1 and 685,609, with no remainder.
Since 685,609 can be divided by just 1 and 685,609, it is a prime number.