A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2710620 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 30 33 36 37 44 45 55 60 66 74 90 99 110 111 132 148 165 180 185 198 220 222 330 333 370 396 407 444 495 555 660 666 740 814 990 1,110 1,221 1,332 1,369 1,628 1,665 1,980 2,035 2,220 2,442 2,738 3,330 3,663 4,070 4,107 4,884 5,476 6,105 6,660 6,845 7,326 8,140 8,214 12,210 12,321 13,690 14,652 15,059 16,428 18,315 20,535 24,420 24,642 27,380 30,118 36,630 41,070 45,177 49,284 60,236 61,605 73,260 75,295 82,140 90,354 123,210 135,531 150,590 180,708 225,885 246,420 271,062 301,180 451,770 542,124 677,655 903,540 1,355,310 and 2,710,620, with no remainder.
Since 2,710,620 cannot be divided by just 1 and 2,710,620, it is not a prime number.