A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2670360 can be evenly divided by 1 2 3 4 5 6 7 8 10 11 12 14 15 17 20 21 22 24 28 30 33 34 35 40 42 44 51 55 56 60 66 68 70 77 84 85 88 102 105 110 119 120 132 136 140 154 165 168 170 187 204 210 220 231 238 255 264 280 289 308 330 340 357 374 385 408 420 440 462 476 510 561 578 595 616 660 680 714 748 770 840 867 924 935 952 1,020 1,122 1,155 1,156 1,190 1,309 1,320 1,428 1,445 1,496 1,540 1,734 1,785 1,848 1,870 2,023 2,040 2,244 2,310 2,312 2,380 2,618 2,805 2,856 2,890 3,080 3,179 3,468 3,570 3,740 3,927 4,046 4,335 4,488 4,620 4,760 5,236 5,610 5,780 6,069 6,358 6,545 6,936 7,140 7,480 7,854 8,092 8,670 9,240 9,537 10,115 10,472 11,220 11,560 12,138 12,716 13,090 14,280 15,708 15,895 16,184 17,340 19,074 19,635 20,230 22,253 22,440 24,276 25,432 26,180 30,345 31,416 31,790 34,680 38,148 39,270 40,460 44,506 47,685 48,552 52,360 60,690 63,580 66,759 76,296 78,540 80,920 89,012 95,370 111,265 121,380 127,160 133,518 157,080 178,024 190,740 222,530 242,760 267,036 333,795 381,480 445,060 534,072 667,590 890,120 1,335,180 and 2,670,360, with no remainder.
Since 2,670,360 cannot be divided by just 1 and 2,670,360, it is not a prime number.