A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5310360 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 27 30 33 36 40 44 45 54 55 60 66 72 81 88 90 99 108 110 120 132 135 149 162 165 180 198 216 220 264 270 297 298 324 330 360 396 405 440 447 495 540 594 596 648 660 745 792 810 891 894 990 1,080 1,188 1,192 1,320 1,341 1,485 1,490 1,620 1,639 1,782 1,788 1,980 2,235 2,376 2,682 2,970 2,980 3,240 3,278 3,564 3,576 3,960 4,023 4,455 4,470 4,917 5,364 5,940 5,960 6,556 6,705 7,128 8,046 8,195 8,910 8,940 9,834 10,728 11,880 12,069 13,112 13,410 14,751 16,092 16,390 17,820 17,880 19,668 20,115 24,138 24,585 26,820 29,502 32,184 32,780 35,640 39,336 40,230 44,253 48,276 49,170 53,640 59,004 60,345 65,560 73,755 80,460 88,506 96,552 98,340 118,008 120,690 132,759 147,510 160,920 177,012 196,680 221,265 241,380 265,518 295,020 354,024 442,530 482,760 531,036 590,040 663,795 885,060 1,062,072 1,327,590 1,770,120 2,655,180 and 5,310,360, with no remainder.
Since 5,310,360 cannot be divided by just 1 and 5,310,360, it is not a prime number.