A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 814680 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 31 36 40 45 60 62 72 73 90 93 120 124 146 155 180 186 219 248 279 292 310 360 365 372 438 465 558 584 620 657 730 744 876 930 1,095 1,116 1,240 1,314 1,395 1,460 1,752 1,860 2,190 2,232 2,263 2,628 2,790 2,920 3,285 3,720 4,380 4,526 5,256 5,580 6,570 6,789 8,760 9,052 11,160 11,315 13,140 13,578 18,104 20,367 22,630 26,280 27,156 33,945 40,734 45,260 54,312 67,890 81,468 90,520 101,835 135,780 162,936 203,670 271,560 407,340 and 814,680, with no remainder.
Since 814,680 cannot be divided by just 1 and 814,680, it is not a prime number.