A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4350000 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 29 30 40 48 50 58 60 75 80 87 100 116 120 125 145 150 174 200 232 240 250 290 300 348 375 400 435 464 500 580 600 625 696 725 750 870 1,000 1,160 1,200 1,250 1,392 1,450 1,500 1,740 1,875 2,000 2,175 2,320 2,500 2,900 3,000 3,125 3,480 3,625 3,750 4,350 5,000 5,800 6,000 6,250 6,960 7,250 7,500 8,700 9,375 10,000 10,875 11,600 12,500 14,500 15,000 17,400 18,125 18,750 21,750 25,000 29,000 30,000 34,800 36,250 37,500 43,500 50,000 54,375 58,000 72,500 75,000 87,000 90,625 108,750 145,000 150,000 174,000 181,250 217,500 271,875 290,000 362,500 435,000 543,750 725,000 870,000 1,087,500 1,450,000 2,175,000 and 4,350,000, with no remainder.
Since 4,350,000 cannot be divided by just 1 and 4,350,000, it is not a prime number.