A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6135066 can be evenly divided by 1 2 3 6 7 9 14 18 21 23 29 42 46 58 63 69 73 87 126 138 146 161 174 203 207 219 261 322 406 414 438 483 511 522 609 657 667 966 1,022 1,218 1,314 1,334 1,449 1,533 1,679 1,827 2,001 2,117 2,898 3,066 3,358 3,654 4,002 4,234 4,599 4,669 5,037 6,003 6,351 9,198 9,338 10,074 11,753 12,006 12,702 14,007 14,819 15,111 19,053 23,506 28,014 29,638 30,222 35,259 38,106 42,021 44,457 48,691 70,518 84,042 88,914 97,382 105,777 133,371 146,073 211,554 266,742 292,146 340,837 438,219 681,674 876,438 1,022,511 2,045,022 3,067,533 and 6,135,066, with no remainder.
Since 6,135,066 cannot be divided by just 1 and 6,135,066, it is not a prime number.