Q: Is 643,680 a Prime Number?
A: No, 643,680 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 643680 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 72 80 90 96 108 120 135 144 149 160 180 216 240 270 288 298 360 432 447 480 540 596 720 745 864 894 1,080 1,192 1,341 1,440 1,490 1,788 2,160 2,235 2,384 2,682 2,980 3,576 4,023 4,320 4,470 4,768 5,364 5,960 6,705 7,152 8,046 8,940 10,728 11,920 13,410 14,304 16,092 17,880 20,115 21,456 23,840 26,820 32,184 35,760 40,230 42,912 53,640 64,368 71,520 80,460 107,280 128,736 160,920 214,560 321,840 and 643,680, with no remainder.
Since 643,680 cannot be divided by just 1 and 643,680, it is not a prime number.