A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3030720 can be evenly divided by 1 2 3 4 5 6 7 8 10 11 12 14 15 16 20 21 22 24 28 30 32 33 35 40 41 42 44 48 55 56 60 64 66 70 77 80 82 84 88 96 105 110 112 120 123 132 140 154 160 164 165 168 176 192 205 210 220 224 231 240 246 264 280 287 308 320 328 330 336 352 385 410 420 440 448 451 462 480 492 528 560 574 615 616 656 660 672 704 770 820 840 861 880 902 924 960 984 1,056 1,120 1,148 1,155 1,230 1,232 1,312 1,320 1,344 1,353 1,435 1,540 1,640 1,680 1,722 1,760 1,804 1,848 1,968 2,112 2,240 2,255 2,296 2,310 2,460 2,464 2,624 2,640 2,706 2,870 3,080 3,157 3,280 3,360 3,444 3,520 3,608 3,696 3,936 4,305 4,510 4,592 4,620 4,920 4,928 5,280 5,412 5,740 6,160 6,314 6,560 6,720 6,765 6,888 7,216 7,392 7,872 8,610 9,020 9,184 9,240 9,471 9,840 10,560 10,824 11,480 12,320 12,628 13,120 13,530 13,776 14,432 14,784 15,785 17,220 18,040 18,368 18,480 18,942 19,680 21,648 22,960 24,640 25,256 27,060 27,552 28,864 31,570 34,440 36,080 36,960 37,884 39,360 43,296 45,920 47,355 50,512 54,120 55,104 63,140 68,880 72,160 73,920 75,768 86,592 91,840 94,710 101,024 108,240 126,280 137,760 144,320 151,536 189,420 202,048 216,480 252,560 275,520 303,072 378,840 432,960 505,120 606,144 757,680 1,010,240 1,515,360 and 3,030,720, with no remainder.
Since 3,030,720 cannot be divided by just 1 and 3,030,720, it is not a prime number.