A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 867300 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 25 28 30 35 42 49 50 59 60 70 75 84 98 100 105 118 140 147 150 175 177 196 210 236 245 294 295 300 350 354 413 420 490 525 588 590 700 708 735 826 885 980 1,050 1,180 1,225 1,239 1,470 1,475 1,652 1,770 2,065 2,100 2,450 2,478 2,891 2,940 2,950 3,540 3,675 4,130 4,425 4,900 4,956 5,782 5,900 6,195 7,350 8,260 8,673 8,850 10,325 11,564 12,390 14,455 14,700 17,346 17,700 20,650 24,780 28,910 30,975 34,692 41,300 43,365 57,820 61,950 72,275 86,730 123,900 144,550 173,460 216,825 289,100 433,650 and 867,300, with no remainder.
Since 867,300 cannot be divided by just 1 and 867,300, it is not a prime number.