A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6276270 can be evenly divided by 1 2 3 5 6 7 10 11 13 14 15 19 21 22 26 30 33 35 38 39 42 55 57 65 66 70 77 78 91 95 105 110 114 121 130 133 143 154 165 182 190 195 209 210 231 242 247 266 273 285 286 330 363 385 390 399 418 429 455 462 494 546 570 605 627 665 715 726 741 770 798 847 858 910 1,001 1,045 1,155 1,210 1,235 1,254 1,330 1,365 1,430 1,463 1,482 1,573 1,694 1,729 1,815 1,995 2,002 2,090 2,145 2,299 2,310 2,470 2,541 2,717 2,730 2,926 3,003 3,135 3,146 3,458 3,630 3,705 3,990 4,235 4,290 4,389 4,598 4,719 5,005 5,082 5,187 5,434 6,006 6,270 6,897 7,315 7,410 7,865 8,151 8,470 8,645 8,778 9,438 10,010 10,374 11,011 11,495 12,705 13,585 13,794 14,630 15,015 15,730 16,093 16,302 17,290 19,019 21,945 22,022 22,990 23,595 25,410 25,935 27,170 29,887 30,030 32,186 33,033 34,485 38,038 40,755 43,890 47,190 48,279 51,870 55,055 57,057 59,774 66,066 68,970 80,465 81,510 89,661 95,095 96,558 110,110 114,114 149,435 160,930 165,165 179,322 190,190 209,209 241,395 285,285 298,870 330,330 418,418 448,305 482,790 570,570 627,627 896,610 1,046,045 1,255,254 2,092,090 3,138,135 and 6,276,270, with no remainder.
Since 6,276,270 cannot be divided by just 1 and 6,276,270, it is not a prime number.