Q: Is 626,640 a Prime Number?
A: No, 626,640 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 626640 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 35 40 42 48 56 60 70 80 84 105 112 120 140 168 210 240 280 336 373 420 560 746 840 1,119 1,492 1,680 1,865 2,238 2,611 2,984 3,730 4,476 5,222 5,595 5,968 7,460 7,833 8,952 10,444 11,190 13,055 14,920 15,666 17,904 20,888 22,380 26,110 29,840 31,332 39,165 41,776 44,760 52,220 62,664 78,330 89,520 104,440 125,328 156,660 208,880 313,320 and 626,640, with no remainder.
Since 626,640 cannot be divided by just 1 and 626,640, it is not a prime number.