Q: Is 685,504 a Prime Number?
A: No, 685,504 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 685504 can be evenly divided by 1 2 4 8 16 32 64 10,711 21,422 42,844 85,688 171,376 342,752 and 685,504, with no remainder.
Since 685,504 cannot be divided by just 1 and 685,504, it is not a prime number.