A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6307000 can be evenly divided by 1 2 4 5 7 8 10 14 17 20 25 28 34 35 40 50 53 56 68 70 85 100 106 119 125 136 140 170 175 200 212 238 250 265 280 340 350 371 424 425 476 500 530 595 680 700 742 850 875 901 952 1,000 1,060 1,190 1,325 1,400 1,484 1,700 1,750 1,802 1,855 2,120 2,125 2,380 2,650 2,968 2,975 3,400 3,500 3,604 3,710 4,250 4,505 4,760 5,300 5,950 6,307 6,625 7,000 7,208 7,420 8,500 9,010 9,275 10,600 11,900 12,614 13,250 14,840 14,875 17,000 18,020 18,550 22,525 23,800 25,228 26,500 29,750 31,535 36,040 37,100 45,050 46,375 50,456 53,000 59,500 63,070 74,200 90,100 92,750 112,625 119,000 126,140 157,675 180,200 185,500 225,250 252,280 315,350 371,000 450,500 630,700 788,375 901,000 1,261,400 1,576,750 3,153,500 and 6,307,000, with no remainder.
Since 6,307,000 cannot be divided by just 1 and 6,307,000, it is not a prime number.