Q: Is 680,640 a Prime Number?
A: No, 680,640 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 680640 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 60 64 80 96 120 160 192 240 320 480 709 960 1,418 2,127 2,836 3,545 4,254 5,672 7,090 8,508 10,635 11,344 14,180 17,016 21,270 22,688 28,360 34,032 42,540 45,376 56,720 68,064 85,080 113,440 136,128 170,160 226,880 340,320 and 680,640, with no remainder.
Since 680,640 cannot be divided by just 1 and 680,640, it is not a prime number.