A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2108160 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 61 64 72 80 90 96 108 120 122 128 135 144 160 180 183 192 216 240 244 256 270 288 305 320 360 366 384 432 480 488 540 549 576 610 640 720 732 768 864 915 960 976 1,080 1,098 1,152 1,220 1,280 1,440 1,464 1,647 1,728 1,830 1,920 1,952 2,160 2,196 2,304 2,440 2,745 2,880 2,928 3,294 3,456 3,660 3,840 3,904 4,320 4,392 4,880 5,490 5,760 5,856 6,588 6,912 7,320 7,808 8,235 8,640 8,784 9,760 10,980 11,520 11,712 13,176 14,640 15,616 16,470 17,280 17,568 19,520 21,960 23,424 26,352 29,280 32,940 34,560 35,136 39,040 43,920 46,848 52,704 58,560 65,880 70,272 78,080 87,840 105,408 117,120 131,760 140,544 175,680 210,816 234,240 263,520 351,360 421,632 527,040 702,720 1,054,080 and 2,108,160, with no remainder.
Since 2,108,160 cannot be divided by just 1 and 2,108,160, it is not a prime number.