A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5315310 can be evenly divided by 1 2 3 5 6 7 9 10 11 13 14 15 18 21 22 26 30 33 35 39 42 45 55 59 63 65 66 70 77 78 90 91 99 105 110 117 118 126 130 143 154 165 177 182 195 198 210 231 234 273 286 295 315 330 354 385 390 413 429 455 462 495 531 546 585 590 630 649 693 715 767 770 819 826 858 885 910 990 1,001 1,062 1,155 1,170 1,239 1,287 1,298 1,365 1,386 1,430 1,534 1,638 1,770 1,947 2,002 2,065 2,145 2,301 2,310 2,478 2,574 2,655 2,730 3,003 3,245 3,465 3,717 3,835 3,894 4,095 4,130 4,290 4,543 4,602 5,005 5,310 5,369 5,841 6,006 6,195 6,435 6,490 6,903 6,930 7,434 7,670 8,190 8,437 9,009 9,086 9,735 10,010 10,738 11,505 11,682 12,390 12,870 13,629 13,806 15,015 16,107 16,874 18,018 18,585 19,470 22,715 23,010 25,311 26,845 27,258 29,205 30,030 32,214 34,515 37,170 40,887 42,185 45,045 45,430 48,321 50,622 53,690 58,410 59,059 68,145 69,030 75,933 80,535 81,774 84,370 90,090 96,642 118,118 126,555 136,290 151,866 161,070 177,177 204,435 241,605 253,110 295,295 354,354 379,665 408,870 483,210 531,531 590,590 759,330 885,885 1,063,062 1,771,770 2,657,655 and 5,315,310, with no remainder.
Since 5,315,310 cannot be divided by just 1 and 5,315,310, it is not a prime number.