A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3065040 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 27 30 33 36 40 43 44 45 48 54 55 60 66 72 80 81 86 88 90 99 108 110 120 129 132 135 144 162 165 172 176 180 198 215 216 220 240 258 264 270 297 324 330 344 360 387 396 405 430 432 440 473 495 516 528 540 594 645 648 660 688 720 774 792 810 860 880 891 946 990 1,032 1,080 1,161 1,188 1,290 1,296 1,320 1,419 1,485 1,548 1,584 1,620 1,720 1,782 1,892 1,935 1,980 2,064 2,160 2,322 2,365 2,376 2,580 2,640 2,838 2,970 3,096 3,240 3,440 3,483 3,564 3,784 3,870 3,960 4,257 4,455 4,644 4,730 4,752 5,160 5,676 5,805 5,940 6,192 6,480 6,966 7,095 7,128 7,568 7,740 7,920 8,514 8,910 9,288 9,460 10,320 11,352 11,610 11,880 12,771 13,932 14,190 14,256 15,480 17,028 17,415 17,820 18,576 18,920 21,285 22,704 23,220 23,760 25,542 27,864 28,380 30,960 34,056 34,830 35,640 37,840 38,313 42,570 46,440 51,084 55,728 56,760 63,855 68,112 69,660 71,280 76,626 85,140 92,880 102,168 113,520 127,710 139,320 153,252 170,280 191,565 204,336 255,420 278,640 306,504 340,560 383,130 510,840 613,008 766,260 1,021,680 1,532,520 and 3,065,040, with no remainder.
Since 3,065,040 cannot be divided by just 1 and 3,065,040, it is not a prime number.