Q: Is 687,980 a Prime Number?
A: No, 687,980 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 687980 can be evenly divided by 1 2 4 5 10 20 41 82 164 205 410 820 839 1,678 3,356 4,195 8,390 16,780 34,399 68,798 137,596 171,995 343,990 and 687,980, with no remainder.
Since 687,980 cannot be divided by just 1 and 687,980, it is not a prime number.