A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2747040 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 59 60 80 96 97 118 120 160 177 194 236 240 291 295 354 388 472 480 485 582 590 708 776 885 944 970 1,164 1,180 1,416 1,455 1,552 1,770 1,888 1,940 2,328 2,360 2,832 2,910 3,104 3,540 3,880 4,656 4,720 5,664 5,723 5,820 7,080 7,760 9,312 9,440 11,446 11,640 14,160 15,520 17,169 22,892 23,280 28,320 28,615 34,338 45,784 46,560 57,230 68,676 85,845 91,568 114,460 137,352 171,690 183,136 228,920 274,704 343,380 457,840 549,408 686,760 915,680 1,373,520 and 2,747,040, with no remainder.
Since 2,747,040 cannot be divided by just 1 and 2,747,040, it is not a prime number.