A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 893520 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 17 18 20 24 30 34 36 40 45 48 51 60 68 72 73 80 85 90 102 120 136 144 146 153 170 180 204 219 240 255 272 292 306 340 360 365 408 438 510 584 612 657 680 720 730 765 816 876 1,020 1,095 1,168 1,224 1,241 1,314 1,360 1,460 1,530 1,752 2,040 2,190 2,448 2,482 2,628 2,920 3,060 3,285 3,504 3,723 4,080 4,380 4,964 5,256 5,840 6,120 6,205 6,570 7,446 8,760 9,928 10,512 11,169 12,240 12,410 13,140 14,892 17,520 18,615 19,856 22,338 24,820 26,280 29,784 37,230 44,676 49,640 52,560 55,845 59,568 74,460 89,352 99,280 111,690 148,920 178,704 223,380 297,840 446,760 and 893,520, with no remainder.
Since 893,520 cannot be divided by just 1 and 893,520, it is not a prime number.