A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6244056 can be evenly divided by 1 2 3 4 6 7 8 9 12 13 14 18 21 24 26 28 36 39 42 52 56 63 72 78 84 91 104 117 126 156 168 182 234 252 273 312 364 468 504 546 728 819 936 953 1,092 1,638 1,906 2,184 2,859 3,276 3,812 5,718 6,552 6,671 7,624 8,577 11,436 12,389 13,342 17,154 20,013 22,872 24,778 26,684 34,308 37,167 40,026 49,556 53,368 60,039 68,616 74,334 80,052 86,723 99,112 111,501 120,078 148,668 160,104 173,446 223,002 240,156 260,169 297,336 346,892 446,004 480,312 520,338 693,784 780,507 892,008 1,040,676 1,561,014 2,081,352 3,122,028 and 6,244,056, with no remainder.
Since 6,244,056 cannot be divided by just 1 and 6,244,056, it is not a prime number.