Q: Is 640,560 a Prime Number?
A: No, 640,560 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 640560 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 24 30 34 40 48 51 60 68 80 85 102 120 136 157 170 204 240 255 272 314 340 408 471 510 628 680 785 816 942 1,020 1,256 1,360 1,570 1,884 2,040 2,355 2,512 2,669 3,140 3,768 4,080 4,710 5,338 6,280 7,536 8,007 9,420 10,676 12,560 13,345 16,014 18,840 21,352 26,690 32,028 37,680 40,035 42,704 53,380 64,056 80,070 106,760 128,112 160,140 213,520 320,280 and 640,560, with no remainder.
Since 640,560 cannot be divided by just 1 and 640,560, it is not a prime number.