A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3814650 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 30 35 42 45 49 50 63 70 75 90 98 105 126 147 150 173 175 210 225 245 294 315 346 350 441 450 490 519 525 630 735 865 882 1,038 1,050 1,211 1,225 1,470 1,557 1,575 1,730 2,205 2,422 2,450 2,595 3,114 3,150 3,633 3,675 4,325 4,410 5,190 6,055 7,266 7,350 7,785 8,477 8,650 10,899 11,025 12,110 12,975 15,570 16,954 18,165 21,798 22,050 25,431 25,950 30,275 36,330 38,925 42,385 50,862 54,495 60,550 76,293 77,850 84,770 90,825 108,990 127,155 152,586 181,650 211,925 254,310 272,475 381,465 423,850 544,950 635,775 762,930 1,271,550 1,907,325 and 3,814,650, with no remainder.
Since 3,814,650 cannot be divided by just 1 and 3,814,650, it is not a prime number.