A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3433320 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 17 18 20 22 24 27 30 33 34 36 40 44 45 51 54 55 60 66 68 72 85 88 90 99 102 108 110 120 132 135 136 153 165 170 180 187 198 204 216 220 255 264 270 289 297 306 330 340 360 374 396 408 440 459 495 510 540 561 578 594 612 660 680 748 765 792 867 918 935 990 1,020 1,080 1,122 1,156 1,188 1,224 1,320 1,445 1,485 1,496 1,530 1,683 1,734 1,836 1,870 1,980 2,040 2,244 2,295 2,312 2,376 2,601 2,805 2,890 2,970 3,060 3,179 3,366 3,468 3,672 3,740 3,960 4,335 4,488 4,590 5,049 5,202 5,610 5,780 5,940 6,120 6,358 6,732 6,936 7,480 7,803 8,415 8,670 9,180 9,537 10,098 10,404 11,220 11,560 11,880 12,716 13,005 13,464 15,606 15,895 16,830 17,340 18,360 19,074 20,196 20,808 22,440 25,245 25,432 26,010 28,611 31,212 31,790 33,660 34,680 38,148 39,015 40,392 47,685 50,490 52,020 57,222 62,424 63,580 67,320 76,296 78,030 85,833 95,370 100,980 104,040 114,444 127,160 143,055 156,060 171,666 190,740 201,960 228,888 286,110 312,120 343,332 381,480 429,165 572,220 686,664 858,330 1,144,440 1,716,660 and 3,433,320, with no remainder.
Since 3,433,320 cannot be divided by just 1 and 3,433,320, it is not a prime number.