Q: Is 840,420 a Prime Number?
A: No, 840,420 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 840420 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 23 28 29 30 35 36 42 45 46 58 60 63 69 70 84 87 90 92 105 115 116 126 138 140 145 161 174 180 203 207 210 230 252 261 276 290 315 322 345 348 406 414 420 435 460 483 522 580 609 630 644 667 690 805 812 828 870 966 1,015 1,035 1,044 1,218 1,260 1,305 1,334 1,380 1,449 1,610 1,740 1,827 1,932 2,001 2,030 2,070 2,415 2,436 2,610 2,668 2,898 3,045 3,220 3,335 3,654 4,002 4,060 4,140 4,669 4,830 5,220 5,796 6,003 6,090 6,670 7,245 7,308 8,004 9,135 9,338 9,660 10,005 12,006 12,180 13,340 14,007 14,490 18,270 18,676 20,010 23,345 24,012 28,014 28,980 30,015 36,540 40,020 42,021 46,690 56,028 60,030 70,035 84,042 93,380 120,060 140,070 168,084 210,105 280,140 420,210 and 840,420, with no remainder.
Since 840,420 cannot be divided by just 1 and 840,420, it is not a prime number.