A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8731030 can be evenly divided by 1 2 5 7 10 11 14 17 22 23 29 34 35 46 55 58 70 77 85 110 115 119 145 154 161 170 187 203 230 238 253 290 319 322 374 385 391 406 493 506 595 638 667 770 782 805 935 986 1,015 1,190 1,265 1,309 1,334 1,595 1,610 1,771 1,870 1,955 2,030 2,233 2,465 2,530 2,618 2,737 3,190 3,335 3,451 3,542 3,910 4,301 4,466 4,669 4,930 5,423 5,474 6,545 6,670 6,902 7,337 8,602 8,855 9,338 10,846 11,165 11,339 13,090 13,685 14,674 17,255 17,710 21,505 22,330 22,678 23,345 27,115 27,370 30,107 34,510 36,685 37,961 43,010 46,690 51,359 54,230 56,695 60,214 73,370 75,922 79,373 102,718 113,390 124,729 150,535 158,746 189,805 249,458 256,795 301,070 379,610 396,865 513,590 623,645 793,730 873,103 1,247,290 1,746,206 4,365,515 and 8,731,030, with no remainder.
Since 8,731,030 cannot be divided by just 1 and 8,731,030, it is not a prime number.