A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7310000 can be evenly divided by 1 2 4 5 8 10 16 17 20 25 34 40 43 50 68 80 85 86 100 125 136 170 172 200 215 250 272 340 344 400 425 430 500 625 680 688 731 850 860 1,000 1,075 1,250 1,360 1,462 1,700 1,720 2,000 2,125 2,150 2,500 2,924 3,400 3,440 3,655 4,250 4,300 5,000 5,375 5,848 6,800 7,310 8,500 8,600 10,000 10,625 10,750 11,696 14,620 17,000 17,200 18,275 21,250 21,500 26,875 29,240 34,000 36,550 42,500 43,000 53,750 58,480 73,100 85,000 86,000 91,375 107,500 146,200 170,000 182,750 215,000 292,400 365,500 430,000 456,875 731,000 913,750 1,462,000 1,827,500 3,655,000 and 7,310,000, with no remainder.
Since 7,310,000 cannot be divided by just 1 and 7,310,000, it is not a prime number.