A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2444040 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 31 36 40 45 54 60 62 72 73 90 93 108 120 124 135 146 155 180 186 216 219 248 270 279 292 310 360 365 372 438 465 540 558 584 620 657 730 744 837 876 930 1,080 1,095 1,116 1,240 1,314 1,395 1,460 1,674 1,752 1,860 1,971 2,190 2,232 2,263 2,628 2,790 2,920 3,285 3,348 3,720 3,942 4,185 4,380 4,526 5,256 5,580 6,570 6,696 6,789 7,884 8,370 8,760 9,052 9,855 11,160 11,315 13,140 13,578 15,768 16,740 18,104 19,710 20,367 22,630 26,280 27,156 33,480 33,945 39,420 40,734 45,260 54,312 61,101 67,890 78,840 81,468 90,520 101,835 122,202 135,780 162,936 203,670 244,404 271,560 305,505 407,340 488,808 611,010 814,680 1,222,020 and 2,444,040, with no remainder.
Since 2,444,040 cannot be divided by just 1 and 2,444,040, it is not a prime number.