A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4243050 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 27 30 35 42 45 50 54 63 70 75 90 105 126 135 150 175 189 210 225 270 315 350 378 449 450 525 630 675 898 945 1,050 1,347 1,350 1,575 1,890 2,245 2,694 3,143 3,150 4,041 4,490 4,725 6,286 6,735 8,082 9,429 9,450 11,225 12,123 13,470 15,715 18,858 20,205 22,450 24,246 28,287 31,430 33,675 40,410 47,145 56,574 60,615 67,350 78,575 84,861 94,290 101,025 121,230 141,435 157,150 169,722 202,050 235,725 282,870 303,075 424,305 471,450 606,150 707,175 848,610 1,414,350 2,121,525 and 4,243,050, with no remainder.
Since 4,243,050 cannot be divided by just 1 and 4,243,050, it is not a prime number.