A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7486560 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 72 80 90 96 108 120 135 144 160 180 216 240 270 288 360 432 480 540 720 864 1,080 1,440 1,733 2,160 3,466 4,320 5,199 6,932 8,665 10,398 13,864 15,597 17,330 20,796 25,995 27,728 31,194 34,660 41,592 46,791 51,990 55,456 62,388 69,320 77,985 83,184 93,582 103,980 124,776 138,640 155,970 166,368 187,164 207,960 233,955 249,552 277,280 311,940 374,328 415,920 467,910 499,104 623,880 748,656 831,840 935,820 1,247,760 1,497,312 1,871,640 2,495,520 3,743,280 and 7,486,560, with no remainder.
Since 7,486,560 cannot be divided by just 1 and 7,486,560, it is not a prime number.