The number 3,434,340 can be evenly divided by 1 2 3 4 5 6 7 10 12 13 14 15 17 20 21 26 28 30 34 35 37 39 42 51 52 60 65 68 70 74 78 84 85 91 102 105 111 119 130 140 148 156 170 182 185 195 204 210 221 222 238 255 259 260 273 340 357 364 370 390 420 442 444 455 476 481 510 518 546 555 595 629 663 714 740 777 780 884 910 962 1,020 1,036 1,092 1,105 1,110 1,190 1,258 1,295 1,326 1,365 1,428 1,443 1,547 1,554 1,785 1,820 1,887 1,924 2,210 2,220 2,380 2,405 2,516 2,590 2,652 2,730 2,886 3,094 3,108 3,145 3,315 3,367 3,570 3,774 3,885 4,403 4,420 4,641 4,810 5,180 5,460 5,772 6,188 6,290 6,630 6,734 7,140 7,215 7,548 7,735 7,770 8,177 8,806 9,282 9,435 9,620 10,101 12,580 13,209 13,260 13,468 14,430 15,470 15,540 16,354 16,835 17,612 18,564 18,870 20,202 22,015 23,205 24,531 26,418 28,860 30,940 32,708 33,670 37,740 40,404 40,885 44,030 46,410 49,062 50,505 52,836 57,239 66,045 67,340 81,770 88,060 92,820 98,124 101,010 114,478 122,655 132,090 163,540 171,717 202,020 228,956 245,310 264,180 286,195 343,434 490,620 572,390 686,868 858,585 1,144,780 1,717,170 and 3,434,340, with no remainder.
Since 3,434,340 cannot be divided by just 1 and 3,434,340, it is a composite number.