A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1037760 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 23 24 30 32 40 46 47 48 60 64 69 80 92 94 96 115 120 138 141 160 184 188 192 230 235 240 276 282 320 345 368 376 460 470 480 552 564 690 705 736 752 920 940 960 1,081 1,104 1,128 1,380 1,410 1,472 1,504 1,840 1,880 2,162 2,208 2,256 2,760 2,820 3,008 3,243 3,680 3,760 4,324 4,416 4,512 5,405 5,520 5,640 6,486 7,360 7,520 8,648 9,024 10,810 11,040 11,280 12,972 15,040 16,215 17,296 21,620 22,080 22,560 25,944 32,430 34,592 43,240 45,120 51,888 64,860 69,184 86,480 103,776 129,720 172,960 207,552 259,440 345,920 518,880 and 1,037,760, with no remainder.
Since 1,037,760 cannot be divided by just 1 and 1,037,760, it is not a prime number.