A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6873300 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 25 28 30 35 36 42 45 50 60 63 70 75 84 90 100 105 126 140 150 175 180 210 225 252 300 315 350 420 450 525 630 700 900 1,050 1,091 1,260 1,575 2,100 2,182 3,150 3,273 4,364 5,455 6,300 6,546 7,637 9,819 10,910 13,092 15,274 16,365 19,638 21,820 22,911 27,275 30,548 32,730 38,185 39,276 45,822 49,095 54,550 65,460 68,733 76,370 81,825 91,644 98,190 109,100 114,555 137,466 152,740 163,650 190,925 196,380 229,110 245,475 274,932 327,300 343,665 381,850 458,220 490,950 572,775 687,330 763,700 981,900 1,145,550 1,374,660 1,718,325 2,291,100 3,436,650 and 6,873,300, with no remainder.
Since 6,873,300 cannot be divided by just 1 and 6,873,300, it is not a prime number.