Q: Is 637,840 a Prime Number?
A: No, 637,840 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 637840 can be evenly divided by 1 2 4 5 7 8 10 14 16 17 20 28 34 35 40 56 67 68 70 80 85 112 119 134 136 140 170 238 268 272 280 335 340 469 476 536 560 595 670 680 938 952 1,072 1,139 1,190 1,340 1,360 1,876 1,904 2,278 2,345 2,380 2,680 3,752 4,556 4,690 4,760 5,360 5,695 7,504 7,973 9,112 9,380 9,520 11,390 15,946 18,224 18,760 22,780 31,892 37,520 39,865 45,560 63,784 79,730 91,120 127,568 159,460 318,920 and 637,840, with no remainder.
Since 637,840 cannot be divided by just 1 and 637,840, it is not a prime number.