A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6475770 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 19 21 30 35 38 42 45 57 63 70 90 95 105 114 126 133 171 190 210 266 285 315 342 399 541 570 630 665 798 855 1,082 1,197 1,330 1,623 1,710 1,995 2,394 2,705 3,246 3,787 3,990 4,869 5,410 5,985 7,574 8,115 9,738 10,279 11,361 11,970 16,230 18,935 20,558 22,722 24,345 30,837 34,083 37,870 48,690 51,395 56,805 61,674 68,166 71,953 92,511 102,790 113,610 143,906 154,185 170,415 185,022 215,859 308,370 340,830 359,765 431,718 462,555 647,577 719,530 925,110 1,079,295 1,295,154 2,158,590 3,237,885 and 6,475,770, with no remainder.
Since 6,475,770 cannot be divided by just 1 and 6,475,770, it is not a prime number.