A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6412140 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 49 60 63 70 84 90 98 105 126 140 147 180 196 210 245 252 294 315 420 441 490 588 630 727 735 882 980 1,260 1,454 1,470 1,764 2,181 2,205 2,908 2,940 3,635 4,362 4,410 5,089 6,543 7,270 8,724 8,820 10,178 10,905 13,086 14,540 15,267 20,356 21,810 25,445 26,172 30,534 32,715 35,623 43,620 45,801 50,890 61,068 65,430 71,246 76,335 91,602 101,780 106,869 130,860 142,492 152,670 178,115 183,204 213,738 229,005 305,340 320,607 356,230 427,476 458,010 534,345 641,214 712,460 916,020 1,068,690 1,282,428 1,603,035 2,137,380 3,206,070 and 6,412,140, with no remainder.
Since 6,412,140 cannot be divided by just 1 and 6,412,140, it is not a prime number.