A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1084800 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 32 40 48 50 60 64 75 80 96 100 113 120 128 150 160 192 200 226 240 300 320 339 384 400 452 480 565 600 640 678 800 904 960 1,130 1,200 1,356 1,600 1,695 1,808 1,920 2,260 2,400 2,712 2,825 3,200 3,390 3,616 4,520 4,800 5,424 5,650 6,780 7,232 8,475 9,040 9,600 10,848 11,300 13,560 14,464 16,950 18,080 21,696 22,600 27,120 33,900 36,160 43,392 45,200 54,240 67,800 72,320 90,400 108,480 135,600 180,800 216,960 271,200 361,600 542,400 and 1,084,800, with no remainder.
Since 1,084,800 cannot be divided by just 1 and 1,084,800, it is not a prime number.