A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8168160 can be evenly divided by 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 20 21 22 24 26 28 30 32 33 34 35 39 40 42 44 48 51 52 55 56 60 65 66 68 70 77 78 80 84 85 88 91 96 102 104 105 110 112 119 120 130 132 136 140 143 154 156 160 165 168 170 176 182 187 195 204 208 210 220 221 224 231 238 240 255 260 264 272 273 280 286 308 312 330 336 340 352 357 364 374 385 390 408 416 420 429 440 442 455 462 476 480 510 520 528 544 546 560 561 572 595 616 624 660 663 672 680 714 715 728 748 770 780 816 840 858 880 884 910 924 935 952 1,001 1,020 1,040 1,056 1,092 1,105 1,120 1,122 1,144 1,155 1,190 1,232 1,248 1,309 1,320 1,326 1,360 1,365 1,428 1,430 1,456 1,496 1,540 1,547 1,560 1,632 1,680 1,716 1,760 1,768 1,785 1,820 1,848 1,870 1,904 2,002 2,040 2,080 2,145 2,184 2,210 2,244 2,288 2,310 2,380 2,431 2,464 2,618 2,640 2,652 2,720 2,730 2,805 2,856 2,860 2,912 2,992 3,003 3,080 3,094 3,120 3,315 3,360 3,432 3,536 3,570 3,640 3,696 3,740 3,808 3,927 4,004 4,080 4,290 4,368 4,420 4,488 4,576 4,620 4,641 4,760 4,862 5,005 5,236 5,280 5,304 5,460 5,610 5,712 5,720 5,984 6,006 6,160 6,188 6,240 6,545 6,630 6,864 7,072 7,140 7,280 7,293 7,392 7,480 7,735 7,854 8,008 8,160 8,580 8,736 8,840 8,976 9,240 9,282 9,520 9,724 10,010 10,472 10,608 10,920 11,220 11,424 11,440 12,012 12,155 12,320 12,376 13,090 13,260 13,728 14,280 14,560 14,586 14,960 15,015 15,470 15,708 16,016 17,017 17,160 17,680 17,952 18,480 18,564 19,040 19,448 19,635 20,020 20,944 21,216 21,840 22,440 22,880 23,205 24,024 24,310 24,752 26,180 26,520 28,560 29,172 29,920 30,030 30,940 31,416 32,032 34,034 34,320 35,360 36,465 36,960 37,128 38,896 39,270 40,040 41,888 43,680 44,880 46,410 48,048 48,620 49,504 51,051 52,360 53,040 57,120 58,344 60,060 61,880 62,832 68,068 68,640 72,930 74,256 77,792 78,540 80,080 85,085 89,760 92,820 96,096 97,240 102,102 104,720 106,080 116,688 120,120 123,760 125,664 136,136 145,860 148,512 157,080 160,160 170,170 185,640 194,480 204,204 209,440 233,376 240,240 247,520 255,255 272,272 291,720 314,160 340,340 371,280 388,960 408,408 480,480 510,510 544,544 583,440 628,320 680,680 742,560 816,816 1,021,020 1,166,880 1,361,360 1,633,632 2,042,040 2,722,720 4,084,080 and 8,168,160, with no remainder.
Since 8,168,160 cannot be divided by just 1 and 8,168,160, it is not a prime number.