A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3538080 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 18 20 21 24 26 27 28 30 32 35 36 39 40 42 45 48 52 54 56 60 63 65 70 72 78 80 81 84 90 91 96 104 105 108 112 117 120 126 130 135 140 144 156 160 162 168 180 182 189 195 208 210 216 224 234 240 243 252 260 270 273 280 288 312 315 324 336 351 360 364 378 390 405 416 420 432 455 468 480 486 504 520 540 546 560 567 585 624 630 648 672 702 720 728 756 780 810 819 840 864 910 936 945 972 1,008 1,040 1,053 1,080 1,092 1,120 1,134 1,170 1,215 1,248 1,260 1,296 1,365 1,404 1,440 1,456 1,512 1,560 1,620 1,638 1,680 1,701 1,755 1,820 1,872 1,890 1,944 2,016 2,080 2,106 2,160 2,184 2,268 2,340 2,430 2,457 2,520 2,592 2,730 2,808 2,835 2,912 3,024 3,120 3,159 3,240 3,276 3,360 3,402 3,510 3,640 3,744 3,780 3,888 4,095 4,212 4,320 4,368 4,536 4,680 4,860 4,914 5,040 5,265 5,460 5,616 5,670 6,048 6,240 6,318 6,480 6,552 6,804 7,020 7,280 7,371 7,560 7,776 8,190 8,424 8,505 8,736 9,072 9,360 9,720 9,828 10,080 10,530 10,920 11,232 11,340 12,285 12,636 12,960 13,104 13,608 14,040 14,560 14,742 15,120 15,795 16,380 16,848 17,010 18,144 18,720 19,440 19,656 21,060 21,840 22,113 22,680 24,570 25,272 26,208 27,216 28,080 29,484 30,240 31,590 32,760 33,696 34,020 36,855 38,880 39,312 42,120 43,680 44,226 45,360 49,140 50,544 54,432 56,160 58,968 63,180 65,520 68,040 73,710 78,624 84,240 88,452 90,720 98,280 101,088 110,565 117,936 126,360 131,040 136,080 147,420 168,480 176,904 196,560 221,130 235,872 252,720 272,160 294,840 353,808 393,120 442,260 505,440 589,680 707,616 884,520 1,179,360 1,769,040 and 3,538,080, with no remainder.
Since 3,538,080 cannot be divided by just 1 and 3,538,080, it is not a prime number.