A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6118470 can be evenly divided by 1 2 3 5 6 9 10 15 17 18 27 30 31 34 43 45 51 54 62 85 86 90 93 102 129 135 153 155 170 186 215 255 258 270 279 306 310 387 430 459 465 510 527 558 645 731 765 774 837 918 930 1,054 1,161 1,290 1,333 1,395 1,462 1,530 1,581 1,674 1,935 2,193 2,295 2,322 2,635 2,666 2,790 3,162 3,655 3,870 3,999 4,185 4,386 4,590 4,743 5,270 5,805 6,579 6,665 7,310 7,905 7,998 8,370 9,486 10,965 11,610 11,997 13,158 13,330 14,229 15,810 19,737 19,995 21,930 22,661 23,715 23,994 28,458 32,895 35,991 39,474 39,990 45,322 47,430 59,985 65,790 67,983 71,145 71,982 98,685 113,305 119,970 135,966 142,290 179,955 197,370 203,949 226,610 339,915 359,910 407,898 611,847 679,830 1,019,745 1,223,694 2,039,490 3,059,235 and 6,118,470, with no remainder.
Since 6,118,470 cannot be divided by just 1 and 6,118,470, it is not a prime number.