A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8664480 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 32 33 36 40 44 45 48 55 60 66 72 80 88 90 96 99 110 120 132 144 160 165 176 180 198 220 240 264 288 330 352 360 396 440 480 495 528 547 660 720 792 880 990 1,056 1,094 1,320 1,440 1,584 1,641 1,760 1,980 2,188 2,640 2,735 3,168 3,282 3,960 4,376 4,923 5,280 5,470 6,017 6,564 7,920 8,205 8,752 9,846 10,940 12,034 13,128 15,840 16,410 17,504 18,051 19,692 21,880 24,068 24,615 26,256 30,085 32,820 36,102 39,384 43,760 48,136 49,230 52,512 54,153 60,170 65,640 72,204 78,768 87,520 90,255 96,272 98,460 108,306 120,340 131,280 144,408 157,536 180,510 192,544 196,920 216,612 240,680 262,560 270,765 288,816 361,020 393,840 433,224 481,360 541,530 577,632 722,040 787,680 866,448 962,720 1,083,060 1,444,080 1,732,896 2,166,120 2,888,160 4,332,240 and 8,664,480, with no remainder.
Since 8,664,480 cannot be divided by just 1 and 8,664,480, it is not a prime number.