A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6222006 can be evenly divided by 1 2 3 6 7 9 14 18 19 21 23 38 42 46 57 63 69 113 114 126 133 138 161 171 207 226 266 322 339 342 399 414 437 483 678 791 798 874 966 1,017 1,197 1,311 1,449 1,582 2,034 2,147 2,373 2,394 2,599 2,622 2,898 3,059 3,933 4,294 4,746 5,198 6,118 6,441 7,119 7,797 7,866 9,177 12,882 14,238 15,029 15,594 18,193 18,354 19,323 23,391 27,531 30,058 36,386 38,646 45,087 46,782 49,381 54,579 55,062 90,174 98,762 109,158 135,261 148,143 163,737 270,522 296,286 327,474 345,667 444,429 691,334 888,858 1,037,001 2,074,002 3,111,003 and 6,222,006, with no remainder.
Since 6,222,006 cannot be divided by just 1 and 6,222,006, it is not a prime number.