A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 442680 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 17 20 21 24 28 30 31 34 35 40 42 51 56 60 62 68 70 84 85 93 102 105 119 120 124 136 140 155 168 170 186 204 210 217 238 248 255 280 310 340 357 372 408 420 434 465 476 510 527 595 620 651 680 714 744 840 868 930 952 1,020 1,054 1,085 1,190 1,240 1,302 1,428 1,581 1,736 1,785 1,860 2,040 2,108 2,170 2,380 2,604 2,635 2,856 3,162 3,255 3,570 3,689 3,720 4,216 4,340 4,760 5,208 5,270 6,324 6,510 7,140 7,378 7,905 8,680 10,540 11,067 12,648 13,020 14,280 14,756 15,810 18,445 21,080 22,134 26,040 29,512 31,620 36,890 44,268 55,335 63,240 73,780 88,536 110,670 147,560 221,340 and 442,680, with no remainder.
Since 442,680 cannot be divided by just 1 and 442,680, it is not a prime number.