A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3384810 can be evenly divided by 1 2 3 5 6 9 10 11 13 15 18 22 26 30 33 39 45 55 65 66 78 90 99 110 117 130 143 165 195 198 234 263 286 330 390 429 495 526 585 715 789 858 990 1,170 1,287 1,315 1,430 1,578 2,145 2,367 2,574 2,630 2,893 3,419 3,945 4,290 4,734 5,786 6,435 6,838 7,890 8,679 10,257 11,835 12,870 14,465 17,095 17,358 20,514 23,670 26,037 28,930 30,771 34,190 37,609 43,395 51,285 52,074 61,542 75,218 86,790 102,570 112,827 130,185 153,855 188,045 225,654 260,370 307,710 338,481 376,090 564,135 676,962 1,128,270 1,692,405 and 3,384,810, with no remainder.
Since 3,384,810 cannot be divided by just 1 and 3,384,810, it is not a prime number.