A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6244236 can be evenly divided by 1 2 3 4 6 9 12 17 18 19 27 34 36 38 51 54 57 68 76 102 108 114 153 171 179 204 228 306 323 342 358 459 513 537 612 646 684 716 918 969 1,026 1,074 1,292 1,611 1,836 1,938 2,052 2,148 2,907 3,043 3,222 3,401 3,876 4,833 5,814 6,086 6,444 6,802 8,721 9,129 9,666 10,203 11,628 12,172 13,604 17,442 18,258 19,332 20,406 27,387 30,609 34,884 36,516 40,812 54,774 57,817 61,218 82,161 91,827 109,548 115,634 122,436 164,322 173,451 183,654 231,268 328,644 346,902 367,308 520,353 693,804 1,040,706 1,561,059 2,081,412 3,122,118 and 6,244,236, with no remainder.
Since 6,244,236 cannot be divided by just 1 and 6,244,236, it is not a prime number.