A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7522560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 64 72 80 90 96 120 128 144 160 180 192 240 256 288 320 360 384 480 576 640 653 720 768 960 1,152 1,280 1,306 1,440 1,920 1,959 2,304 2,612 2,880 3,265 3,840 3,918 5,224 5,760 5,877 6,530 7,836 9,795 10,448 11,520 11,754 13,060 15,672 19,590 20,896 23,508 26,120 29,385 31,344 39,180 41,792 47,016 52,240 58,770 62,688 78,360 83,584 94,032 104,480 117,540 125,376 156,720 167,168 188,064 208,960 235,080 250,752 313,440 376,128 417,920 470,160 501,504 626,880 752,256 835,840 940,320 1,253,760 1,504,512 1,880,640 2,507,520 3,761,280 and 7,522,560, with no remainder.
Since 7,522,560 cannot be divided by just 1 and 7,522,560, it is not a prime number.