The number 2,312,310 can be evenly divided by 1 2 3 5 6 7 10 11 13 14 15 21 22 26 30 33 35 39 42 49 55 65 66 70 77 78 91 98 105 110 121 130 143 147 154 165 182 195 210 231 242 245 273 286 294 330 363 385 390 429 455 462 490 539 546 605 637 715 726 735 770 847 858 910 1,001 1,078 1,155 1,210 1,274 1,365 1,430 1,470 1,573 1,617 1,694 1,815 1,911 2,002 2,145 2,310 2,541 2,695 2,730 3,003 3,146 3,185 3,234 3,630 3,822 4,235 4,290 4,719 5,005 5,082 5,390 5,929 6,006 6,370 7,007 7,865 8,085 8,470 9,438 9,555 10,010 11,011 11,858 12,705 14,014 15,015 15,730 16,170 17,787 19,110 21,021 22,022 23,595 25,410 29,645 30,030 33,033 35,035 35,574 42,042 47,190 55,055 59,290 66,066 70,070 77,077 88,935 105,105 110,110 154,154 165,165 177,870 210,210 231,231 330,330 385,385 462,462 770,770 1,156,155 and 2,312,310, with no remainder.
Since 2,312,310 cannot be divided by just 1 and 2,312,310, it is a composite number.