Q: Is 628,840 a Prime Number?
A: No, 628,840 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 628840 can be evenly divided by 1 2 4 5 8 10 20 40 79 158 199 316 395 398 632 790 796 995 1,580 1,592 1,990 3,160 3,980 7,960 15,721 31,442 62,884 78,605 125,768 157,210 314,420 and 628,840, with no remainder.
Since 628,840 cannot be divided by just 1 and 628,840, it is not a prime number.