A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2134440 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 11 12 14 15 18 20 21 22 24 28 30 33 35 36 40 42 44 45 49 55 56 60 63 66 70 72 77 84 88 90 98 99 105 110 120 121 126 132 140 147 154 165 168 180 196 198 210 220 231 242 245 252 264 280 294 308 315 330 360 363 385 392 396 420 440 441 462 484 490 495 504 539 588 605 616 630 660 693 726 735 770 792 840 847 882 924 968 980 990 1,078 1,089 1,155 1,176 1,210 1,260 1,320 1,386 1,452 1,470 1,540 1,617 1,694 1,764 1,815 1,848 1,960 1,980 2,156 2,178 2,205 2,310 2,420 2,520 2,541 2,695 2,772 2,904 2,940 3,080 3,234 3,388 3,465 3,528 3,630 3,960 4,235 4,312 4,356 4,410 4,620 4,840 4,851 5,082 5,390 5,445 5,544 5,880 5,929 6,468 6,776 6,930 7,260 7,623 8,085 8,470 8,712 8,820 9,240 9,702 10,164 10,780 10,890 11,858 12,705 12,936 13,860 14,520 15,246 16,170 16,940 17,640 17,787 19,404 20,328 21,560 21,780 23,716 24,255 25,410 27,720 29,645 30,492 32,340 33,880 35,574 38,115 38,808 43,560 47,432 48,510 50,820 53,361 59,290 60,984 64,680 71,148 76,230 88,935 97,020 101,640 106,722 118,580 142,296 152,460 177,870 194,040 213,444 237,160 266,805 304,920 355,740 426,888 533,610 711,480 1,067,220 and 2,134,440, with no remainder.
Since 2,134,440 cannot be divided by just 1 and 2,134,440, it is not a prime number.