A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3844260 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 45 54 60 63 70 81 84 90 105 108 113 126 135 140 162 180 189 210 226 243 252 270 315 324 339 378 405 420 452 486 540 565 567 630 678 756 791 810 945 972 1,017 1,130 1,134 1,215 1,260 1,356 1,582 1,620 1,695 1,701 1,890 2,034 2,260 2,268 2,373 2,430 2,835 3,051 3,164 3,390 3,402 3,780 3,955 4,068 4,746 4,860 5,085 5,670 6,102 6,780 6,804 7,119 7,910 8,505 9,153 9,492 10,170 11,340 11,865 12,204 14,238 15,255 15,820 17,010 18,306 20,340 21,357 23,730 27,459 28,476 30,510 34,020 35,595 36,612 42,714 45,765 47,460 54,918 61,020 64,071 71,190 85,428 91,530 106,785 109,836 128,142 137,295 142,380 183,060 192,213 213,570 256,284 274,590 320,355 384,426 427,140 549,180 640,710 768,852 961,065 1,281,420 1,922,130 and 3,844,260, with no remainder.
Since 3,844,260 cannot be divided by just 1 and 3,844,260, it is not a prime number.