A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2750440 can be evenly divided by 1 2 4 5 7 8 10 11 14 19 20 22 28 35 38 40 44 47 55 56 70 76 77 88 94 95 110 133 140 152 154 188 190 209 220 235 266 280 308 329 376 380 385 418 440 470 517 532 616 658 665 760 770 836 893 940 1,034 1,045 1,064 1,316 1,330 1,463 1,540 1,645 1,672 1,786 1,880 2,068 2,090 2,585 2,632 2,660 2,926 3,080 3,290 3,572 3,619 4,136 4,180 4,465 5,170 5,320 5,852 6,251 6,580 7,144 7,238 7,315 8,360 8,930 9,823 10,340 11,704 12,502 13,160 14,476 14,630 17,860 18,095 19,646 20,680 25,004 28,952 29,260 31,255 35,720 36,190 39,292 49,115 50,008 58,520 62,510 68,761 72,380 78,584 98,230 125,020 137,522 144,760 196,460 250,040 275,044 343,805 392,920 550,088 687,610 1,375,220 and 2,750,440, with no remainder.
Since 2,750,440 cannot be divided by just 1 and 2,750,440, it is not a prime number.