A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3413340 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 43 45 49 54 60 63 70 81 84 86 90 98 105 108 126 129 135 140 147 162 172 180 189 196 210 215 245 252 258 270 294 301 315 324 378 387 405 420 430 441 490 516 540 567 588 602 630 645 735 756 774 810 860 882 903 945 980 1,134 1,161 1,204 1,260 1,290 1,323 1,470 1,505 1,548 1,620 1,764 1,806 1,890 1,935 2,107 2,205 2,268 2,322 2,580 2,646 2,709 2,835 2,940 3,010 3,483 3,612 3,780 3,870 3,969 4,214 4,410 4,515 4,644 5,292 5,418 5,670 5,805 6,020 6,321 6,615 6,966 7,740 7,938 8,127 8,428 8,820 9,030 10,535 10,836 11,340 11,610 12,642 13,230 13,545 13,932 15,876 16,254 17,415 18,060 18,963 19,845 21,070 23,220 24,381 25,284 26,460 27,090 31,605 32,508 34,830 37,926 39,690 40,635 42,140 48,762 54,180 56,889 63,210 69,660 75,852 79,380 81,270 94,815 97,524 113,778 121,905 126,420 162,540 170,667 189,630 227,556 243,810 284,445 341,334 379,260 487,620 568,890 682,668 853,335 1,137,780 1,706,670 and 3,413,340, with no remainder.
Since 3,413,340 cannot be divided by just 1 and 3,413,340, it is not a prime number.