A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2196320 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 37 40 53 56 70 74 80 106 112 140 148 160 185 212 224 259 265 280 296 370 371 424 518 530 560 592 740 742 848 1,036 1,060 1,120 1,184 1,295 1,480 1,484 1,696 1,855 1,961 2,072 2,120 2,590 2,960 2,968 3,710 3,922 4,144 4,240 5,180 5,920 5,936 7,420 7,844 8,288 8,480 9,805 10,360 11,872 13,727 14,840 15,688 19,610 20,720 27,454 29,680 31,376 39,220 41,440 54,908 59,360 62,752 68,635 78,440 109,816 137,270 156,880 219,632 274,540 313,760 439,264 549,080 1,098,160 and 2,196,320, with no remainder.
Since 2,196,320 cannot be divided by just 1 and 2,196,320, it is not a prime number.