A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1144800 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 32 36 40 45 48 50 53 54 60 72 75 80 90 96 100 106 108 120 135 144 150 159 160 180 200 212 216 225 240 265 270 288 300 318 360 400 424 432 450 477 480 530 540 600 636 675 720 795 800 848 864 900 954 1,060 1,080 1,200 1,272 1,325 1,350 1,431 1,440 1,590 1,696 1,800 1,908 2,120 2,160 2,385 2,400 2,544 2,650 2,700 2,862 3,180 3,600 3,816 3,975 4,240 4,320 4,770 5,088 5,300 5,400 5,724 6,360 7,155 7,200 7,632 7,950 8,480 9,540 10,600 10,800 11,448 11,925 12,720 14,310 15,264 15,900 19,080 21,200 21,600 22,896 23,850 25,440 28,620 31,800 35,775 38,160 42,400 45,792 47,700 57,240 63,600 71,550 76,320 95,400 114,480 127,200 143,100 190,800 228,960 286,200 381,600 572,400 and 1,144,800, with no remainder.
Since 1,144,800 cannot be divided by just 1 and 1,144,800, it is not a prime number.