Q: Is 628,640 a Prime Number?
A: No, 628,640 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 628640 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 3,929 7,858 15,716 19,645 31,432 39,290 62,864 78,580 125,728 157,160 314,320 and 628,640, with no remainder.
Since 628,640 cannot be divided by just 1 and 628,640, it is not a prime number.