A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8634360 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 19 20 21 24 28 30 35 38 40 42 56 57 60 70 76 84 95 105 114 120 133 140 152 168 190 210 228 266 280 285 380 399 420 456 532 541 570 665 760 798 840 1,064 1,082 1,140 1,330 1,596 1,623 1,995 2,164 2,280 2,660 2,705 3,192 3,246 3,787 3,990 4,328 5,320 5,410 6,492 7,574 7,980 8,115 10,279 10,820 11,361 12,984 15,148 15,960 16,230 18,935 20,558 21,640 22,722 30,296 30,837 32,460 37,870 41,116 45,444 51,395 56,805 61,674 64,920 71,953 75,740 82,232 90,888 102,790 113,610 123,348 143,906 151,480 154,185 205,580 215,859 227,220 246,696 287,812 308,370 359,765 411,160 431,718 454,440 575,624 616,740 719,530 863,436 1,079,295 1,233,480 1,439,060 1,726,872 2,158,590 2,878,120 4,317,180 and 8,634,360, with no remainder.
Since 8,634,360 cannot be divided by just 1 and 8,634,360, it is not a prime number.