A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2584800 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 30 32 36 40 45 48 50 60 72 75 80 90 96 100 120 144 150 160 180 200 225 240 288 300 359 360 400 450 480 600 718 720 800 900 1,077 1,200 1,436 1,440 1,795 1,800 2,154 2,400 2,872 3,231 3,590 3,600 4,308 5,385 5,744 6,462 7,180 7,200 8,616 8,975 10,770 11,488 12,924 14,360 16,155 17,232 17,950 21,540 25,848 26,925 28,720 32,310 34,464 35,900 43,080 51,696 53,850 57,440 64,620 71,800 80,775 86,160 103,392 107,700 129,240 143,600 161,550 172,320 215,400 258,480 287,200 323,100 430,800 516,960 646,200 861,600 1,292,400 and 2,584,800, with no remainder.
Since 2,584,800 cannot be divided by just 1 and 2,584,800, it is not a prime number.