A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3127080 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 20 22 23 24 30 33 40 44 46 55 60 66 69 88 92 103 110 115 120 132 138 165 184 206 220 230 253 264 276 309 330 345 412 440 460 506 515 552 618 660 690 759 824 920 1,012 1,030 1,133 1,236 1,265 1,320 1,380 1,518 1,545 2,024 2,060 2,266 2,369 2,472 2,530 2,760 3,036 3,090 3,399 3,795 4,120 4,532 4,738 5,060 5,665 6,072 6,180 6,798 7,107 7,590 9,064 9,476 10,120 11,330 11,845 12,360 13,596 14,214 15,180 16,995 18,952 22,660 23,690 26,059 27,192 28,428 30,360 33,990 35,535 45,320 47,380 52,118 56,856 67,980 71,070 78,177 94,760 104,236 130,295 135,960 142,140 156,354 208,472 260,590 284,280 312,708 390,885 521,180 625,416 781,770 1,042,360 1,563,540 and 3,127,080, with no remainder.
Since 3,127,080 cannot be divided by just 1 and 3,127,080, it is not a prime number.