A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8481060 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 53 60 63 70 84 90 105 106 126 127 140 159 180 210 212 252 254 265 315 318 371 381 420 477 508 530 630 635 636 742 762 795 889 954 1,060 1,113 1,143 1,260 1,270 1,484 1,524 1,590 1,778 1,855 1,905 1,908 2,226 2,286 2,385 2,540 2,667 3,180 3,339 3,556 3,710 3,810 4,445 4,452 4,572 4,770 5,334 5,565 5,715 6,678 6,731 7,420 7,620 8,001 8,890 9,540 10,668 11,130 11,430 13,335 13,356 13,462 16,002 16,695 17,780 20,193 22,260 22,860 26,670 26,924 32,004 33,390 33,655 40,005 40,386 47,117 53,340 60,579 66,780 67,310 80,010 80,772 94,234 100,965 121,158 134,620 141,351 160,020 188,468 201,930 235,585 242,316 282,702 302,895 403,860 424,053 471,170 565,404 605,790 706,755 848,106 942,340 1,211,580 1,413,510 1,696,212 2,120,265 2,827,020 4,240,530 and 8,481,060, with no remainder.
Since 8,481,060 cannot be divided by just 1 and 8,481,060, it is not a prime number.