A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6750700 can be evenly divided by 1 2 4 5 10 11 17 19 20 22 25 34 38 44 50 55 68 76 85 95 100 110 170 187 190 209 220 275 323 340 361 374 380 418 425 475 550 646 722 748 836 850 935 950 1,045 1,100 1,292 1,444 1,615 1,700 1,805 1,870 1,900 2,090 3,230 3,553 3,610 3,740 3,971 4,180 4,675 5,225 6,137 6,460 7,106 7,220 7,942 8,075 9,025 9,350 10,450 12,274 14,212 15,884 16,150 17,765 18,050 18,700 19,855 20,900 24,548 30,685 32,300 35,530 36,100 39,710 61,370 67,507 71,060 79,420 88,825 99,275 122,740 135,014 153,425 177,650 198,550 270,028 306,850 337,535 355,300 397,100 613,700 675,070 1,350,140 1,687,675 3,375,350 and 6,750,700, with no remainder.
Since 6,750,700 cannot be divided by just 1 and 6,750,700, it is not a prime number.