A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6477450 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 25 30 31 35 42 50 62 70 75 93 105 150 155 175 186 199 210 217 310 350 398 434 465 525 597 651 775 930 995 1,050 1,085 1,194 1,302 1,393 1,550 1,990 2,170 2,325 2,786 2,985 3,255 4,179 4,650 4,975 5,425 5,970 6,169 6,510 6,965 8,358 9,950 10,850 12,338 13,930 14,925 16,275 18,507 20,895 29,850 30,845 32,550 34,825 37,014 41,790 43,183 61,690 69,650 86,366 92,535 104,475 129,549 154,225 185,070 208,950 215,915 259,098 308,450 431,830 462,675 647,745 925,350 1,079,575 1,295,490 2,159,150 3,238,725 and 6,477,450, with no remainder.
Since 6,477,450 cannot be divided by just 1 and 6,477,450, it is not a prime number.