Q: Is 648,640 a Prime Number?
A: No, 648,640 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 648640 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 160 320 2,027 4,054 8,108 10,135 16,216 20,270 32,432 40,540 64,864 81,080 129,728 162,160 324,320 and 648,640, with no remainder.
Since 648,640 cannot be divided by just 1 and 648,640, it is not a prime number.