A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2320560 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 33 36 40 44 45 48 55 60 66 72 80 88 90 99 110 120 132 144 165 176 180 198 220 240 264 293 330 360 396 440 495 528 586 660 720 792 879 880 990 1,172 1,320 1,465 1,584 1,758 1,980 2,344 2,637 2,640 2,930 3,223 3,516 3,960 4,395 4,688 5,274 5,860 6,446 7,032 7,920 8,790 9,669 10,548 11,720 12,892 13,185 14,064 16,115 17,580 19,338 21,096 23,440 25,784 26,370 29,007 32,230 35,160 38,676 42,192 48,345 51,568 52,740 58,014 64,460 70,320 77,352 96,690 105,480 116,028 128,920 145,035 154,704 193,380 210,960 232,056 257,840 290,070 386,760 464,112 580,140 773,520 1,160,280 and 2,320,560, with no remainder.
Since 2,320,560 cannot be divided by just 1 and 2,320,560, it is not a prime number.