A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2207016 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 28 29 36 42 56 58 63 72 84 87 116 126 151 168 174 203 232 252 261 302 348 406 453 504 522 604 609 696 812 906 1,044 1,057 1,208 1,218 1,359 1,624 1,812 1,827 2,088 2,114 2,436 2,718 3,171 3,624 3,654 4,228 4,379 4,872 5,436 6,342 7,308 8,456 8,758 9,513 10,872 12,684 13,137 14,616 17,516 19,026 25,368 26,274 30,653 35,032 38,052 39,411 52,548 61,306 76,104 78,822 91,959 105,096 122,612 157,644 183,918 245,224 275,877 315,288 367,836 551,754 735,672 1,103,508 and 2,207,016, with no remainder.
Since 2,207,016 cannot be divided by just 1 and 2,207,016, it is not a prime number.