A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2076120 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 73 79 90 120 146 158 180 219 237 292 316 360 365 395 438 474 584 632 657 711 730 790 876 948 1,095 1,185 1,314 1,422 1,460 1,580 1,752 1,896 2,190 2,370 2,628 2,844 2,920 3,160 3,285 3,555 4,380 4,740 5,256 5,688 5,767 6,570 7,110 8,760 9,480 11,534 13,140 14,220 17,301 23,068 26,280 28,440 28,835 34,602 46,136 51,903 57,670 69,204 86,505 103,806 115,340 138,408 173,010 207,612 230,680 259,515 346,020 415,224 519,030 692,040 1,038,060 and 2,076,120, with no remainder.
Since 2,076,120 cannot be divided by just 1 and 2,076,120, it is not a prime number.