A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2884560 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 17 20 21 24 28 30 34 35 40 42 48 51 56 60 68 70 80 84 85 101 102 105 112 119 120 136 140 168 170 202 204 210 238 240 255 272 280 303 336 340 357 404 408 420 476 505 510 560 595 606 680 707 714 808 816 840 952 1,010 1,020 1,190 1,212 1,360 1,414 1,428 1,515 1,616 1,680 1,717 1,785 1,904 2,020 2,040 2,121 2,380 2,424 2,828 2,856 3,030 3,434 3,535 3,570 4,040 4,080 4,242 4,760 4,848 5,151 5,656 5,712 6,060 6,868 7,070 7,140 8,080 8,484 8,585 9,520 10,302 10,605 11,312 12,019 12,120 13,736 14,140 14,280 16,968 17,170 20,604 21,210 24,038 24,240 25,755 27,472 28,280 28,560 33,936 34,340 36,057 41,208 42,420 48,076 51,510 56,560 60,095 68,680 72,114 82,416 84,840 96,152 103,020 120,190 137,360 144,228 169,680 180,285 192,304 206,040 240,380 288,456 360,570 412,080 480,760 576,912 721,140 961,520 1,442,280 and 2,884,560, with no remainder.
Since 2,884,560 cannot be divided by just 1 and 2,884,560, it is not a prime number.