A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4557120 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 47 48 60 64 80 94 96 101 120 141 160 188 192 202 235 240 282 303 320 376 404 470 480 505 564 606 705 752 808 940 960 1,010 1,128 1,212 1,410 1,504 1,515 1,616 1,880 2,020 2,256 2,424 2,820 3,008 3,030 3,232 3,760 4,040 4,512 4,747 4,848 5,640 6,060 6,464 7,520 8,080 9,024 9,494 9,696 11,280 12,120 14,241 15,040 16,160 18,988 19,392 22,560 23,735 24,240 28,482 32,320 37,976 45,120 47,470 48,480 56,964 71,205 75,952 94,940 96,960 113,928 142,410 151,904 189,880 227,856 284,820 303,808 379,760 455,712 569,640 759,520 911,424 1,139,280 1,519,040 2,278,560 and 4,557,120, with no remainder.
Since 4,557,120 cannot be divided by just 1 and 4,557,120, it is not a prime number.