A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6763770 can be evenly divided by 1 2 3 5 6 9 10 13 15 18 26 27 30 39 41 45 47 54 65 78 82 90 94 117 123 130 135 141 195 205 234 235 246 270 282 351 369 390 410 423 470 533 585 611 615 702 705 738 846 1,066 1,107 1,170 1,222 1,230 1,269 1,410 1,599 1,755 1,833 1,845 1,927 2,115 2,214 2,538 2,665 3,055 3,198 3,510 3,666 3,690 3,854 4,230 4,797 5,330 5,499 5,535 5,781 6,110 6,345 7,995 9,165 9,594 9,635 10,998 11,070 11,562 12,690 14,391 15,990 16,497 17,343 18,330 19,270 23,985 25,051 27,495 28,782 28,905 32,994 34,686 47,970 50,102 52,029 54,990 57,810 71,955 75,153 82,485 86,715 104,058 125,255 143,910 150,306 164,970 173,430 225,459 250,510 260,145 375,765 450,918 520,290 676,377 751,530 1,127,295 1,352,754 2,254,590 3,381,885 and 6,763,770, with no remainder.
Since 6,763,770 cannot be divided by just 1 and 6,763,770, it is not a prime number.