Q: Is 686,680 a Prime Number?
A: No, 686,680 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 686680 can be evenly divided by 1 2 4 5 8 10 20 40 17,167 34,334 68,668 85,835 137,336 171,670 343,340 and 686,680, with no remainder.
Since 686,680 cannot be divided by just 1 and 686,680, it is not a prime number.