A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4550238 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 33 42 49 63 66 67 77 98 99 126 134 147 154 198 201 231 294 343 402 441 462 469 539 603 686 693 737 882 938 1,029 1,078 1,206 1,386 1,407 1,474 1,617 2,058 2,211 2,814 3,087 3,234 3,283 3,773 4,221 4,422 4,851 5,159 6,174 6,566 6,633 7,546 8,442 9,702 9,849 10,318 11,319 13,266 15,477 19,698 22,638 22,981 29,547 30,954 33,957 36,113 45,962 46,431 59,094 67,914 68,943 72,226 92,862 108,339 137,886 206,829 216,678 252,791 325,017 413,658 505,582 650,034 758,373 1,516,746 2,275,119 and 4,550,238, with no remainder.
Since 4,550,238 cannot be divided by just 1 and 4,550,238, it is not a prime number.