A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3146094 can be evenly divided by 1 2 3 6 7 9 14 18 21 27 29 41 42 49 54 58 63 82 87 98 123 126 147 174 189 203 246 261 287 294 369 378 406 441 522 574 609 738 783 861 882 1,107 1,189 1,218 1,323 1,421 1,566 1,722 1,827 2,009 2,214 2,378 2,583 2,646 2,842 3,567 3,654 4,018 4,263 5,166 5,481 6,027 7,134 7,749 8,323 8,526 10,701 10,962 12,054 12,789 15,498 16,646 18,081 21,402 24,969 25,578 32,103 36,162 38,367 49,938 54,243 58,261 64,206 74,907 76,734 108,486 116,522 149,814 174,783 224,721 349,566 449,442 524,349 1,048,698 1,573,047 and 3,146,094, with no remainder.
Since 3,146,094 cannot be divided by just 1 and 3,146,094, it is not a prime number.