Q: Is 408,240 a Prime Number?
A: No, 408,240 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 408240 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 30 35 36 40 42 45 48 54 56 60 63 70 72 80 81 84 90 105 108 112 120 126 135 140 144 162 168 180 189 210 216 240 243 252 270 280 315 324 336 360 378 405 420 432 486 504 540 560 567 630 648 720 729 756 810 840 945 972 1,008 1,080 1,134 1,215 1,260 1,296 1,458 1,512 1,620 1,680 1,701 1,890 1,944 2,160 2,268 2,430 2,520 2,835 2,916 3,024 3,240 3,402 3,645 3,780 3,888 4,536 4,860 5,040 5,103 5,670 5,832 6,480 6,804 7,290 7,560 8,505 9,072 9,720 10,206 11,340 11,664 13,608 14,580 15,120 17,010 19,440 20,412 22,680 25,515 27,216 29,160 34,020 40,824 45,360 51,030 58,320 68,040 81,648 102,060 136,080 204,120 and 408,240, with no remainder.
Since 408,240 cannot be divided by just 1 and 408,240, it is not a prime number.