A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3035520 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 17 18 20 24 30 31 32 34 36 40 45 48 51 60 62 64 68 72 80 85 90 93 96 102 120 124 128 136 144 153 155 160 170 180 186 192 204 240 248 255 272 279 288 306 310 320 340 360 372 384 408 465 480 496 510 527 544 558 576 612 620 640 680 720 744 765 816 930 960 992 1,020 1,054 1,088 1,116 1,152 1,224 1,240 1,360 1,395 1,440 1,488 1,530 1,581 1,632 1,860 1,920 1,984 2,040 2,108 2,176 2,232 2,448 2,480 2,635 2,720 2,790 2,880 2,976 3,060 3,162 3,264 3,720 3,968 4,080 4,216 4,464 4,743 4,896 4,960 5,270 5,440 5,580 5,760 5,952 6,120 6,324 6,528 7,440 7,905 8,160 8,432 8,928 9,486 9,792 9,920 10,540 10,880 11,160 11,904 12,240 12,648 14,880 15,810 16,320 16,864 17,856 18,972 19,584 19,840 21,080 22,320 23,715 24,480 25,296 29,760 31,620 32,640 33,728 35,712 37,944 42,160 44,640 47,430 48,960 50,592 59,520 63,240 67,456 75,888 84,320 89,280 94,860 97,920 101,184 126,480 151,776 168,640 178,560 189,720 202,368 252,960 303,552 337,280 379,440 505,920 607,104 758,880 1,011,840 1,517,760 and 3,035,520, with no remainder.
Since 3,035,520 cannot be divided by just 1 and 3,035,520, it is not a prime number.