A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2704380 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 47 60 70 84 94 105 137 140 141 188 210 235 274 282 329 411 420 470 548 564 658 685 705 822 940 959 987 1,316 1,370 1,410 1,644 1,645 1,918 1,974 2,055 2,740 2,820 2,877 3,290 3,836 3,948 4,110 4,795 4,935 5,754 6,439 6,580 8,220 9,590 9,870 11,508 12,878 14,385 19,180 19,317 19,740 25,756 28,770 32,195 38,634 45,073 57,540 64,390 77,268 90,146 96,585 128,780 135,219 180,292 193,170 225,365 270,438 386,340 450,730 540,876 676,095 901,460 1,352,190 and 2,704,380, with no remainder.
Since 2,704,380 cannot be divided by just 1 and 2,704,380, it is not a prime number.