A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1044680 can be evenly divided by 1 2 4 5 7 8 10 13 14 20 26 28 35 40 41 49 52 56 65 70 82 91 98 104 130 140 164 182 196 205 245 260 280 287 328 364 392 410 455 490 520 533 574 637 728 820 910 980 1,066 1,148 1,274 1,435 1,640 1,820 1,960 2,009 2,132 2,296 2,548 2,665 2,870 3,185 3,640 3,731 4,018 4,264 5,096 5,330 5,740 6,370 7,462 8,036 10,045 10,660 11,480 12,740 14,924 16,072 18,655 20,090 21,320 25,480 26,117 29,848 37,310 40,180 52,234 74,620 80,360 104,468 130,585 149,240 208,936 261,170 522,340 and 1,044,680, with no remainder.
Since 1,044,680 cannot be divided by just 1 and 1,044,680, it is not a prime number.