Q: Is 687,939 a Prime Number?
A: No, 687,939 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 687939 can be evenly divided by 1 3 7 17 21 41 47 51 119 123 141 287 329 357 697 799 861 987 1,927 2,091 2,397 4,879 5,593 5,781 13,489 14,637 16,779 32,759 40,467 98,277 229,313 and 687,939, with no remainder.
Since 687,939 cannot be divided by just 1 and 687,939, it is not a prime number.