A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2825280 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 64 72 80 81 90 96 108 109 120 135 144 160 162 180 192 216 218 240 270 288 320 324 327 360 405 432 436 480 540 545 576 648 654 720 810 864 872 960 981 1,080 1,090 1,296 1,308 1,440 1,620 1,635 1,728 1,744 1,962 2,160 2,180 2,592 2,616 2,880 2,943 3,240 3,270 3,488 3,924 4,320 4,360 4,905 5,184 5,232 5,886 6,480 6,540 6,976 7,848 8,640 8,720 8,829 9,810 10,464 11,772 12,960 13,080 14,715 15,696 17,440 17,658 19,620 20,928 23,544 25,920 26,160 29,430 31,392 34,880 35,316 39,240 44,145 47,088 52,320 58,860 62,784 70,632 78,480 88,290 94,176 104,640 117,720 141,264 156,960 176,580 188,352 235,440 282,528 313,920 353,160 470,880 565,056 706,320 941,760 1,412,640 and 2,825,280, with no remainder.
Since 2,825,280 cannot be divided by just 1 and 2,825,280, it is not a prime number.