A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3022920 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 36 40 45 54 60 72 81 90 108 120 135 162 180 216 243 270 311 324 360 405 486 540 622 648 810 933 972 1,080 1,215 1,244 1,555 1,620 1,866 1,944 2,430 2,488 2,799 3,110 3,240 3,732 4,665 4,860 5,598 6,220 7,464 8,397 9,330 9,720 11,196 12,440 13,995 16,794 18,660 22,392 25,191 27,990 33,588 37,320 41,985 50,382 55,980 67,176 75,573 83,970 100,764 111,960 125,955 151,146 167,940 201,528 251,910 302,292 335,880 377,865 503,820 604,584 755,730 1,007,640 1,511,460 and 3,022,920, with no remainder.
Since 3,022,920 cannot be divided by just 1 and 3,022,920, it is not a prime number.