A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6289056 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 29 32 36 48 54 58 72 87 96 108 116 144 174 216 232 251 261 288 348 432 464 502 522 696 753 783 864 928 1,004 1,044 1,392 1,506 1,566 2,008 2,088 2,259 2,784 3,012 3,132 4,016 4,176 4,518 6,024 6,264 6,777 7,279 8,032 8,352 9,036 12,048 12,528 13,554 14,558 18,072 21,837 24,096 25,056 27,108 29,116 36,144 43,674 54,216 58,232 65,511 72,288 87,348 108,432 116,464 131,022 174,696 196,533 216,864 232,928 262,044 349,392 393,066 524,088 698,784 786,132 1,048,176 1,572,264 2,096,352 3,144,528 and 6,289,056, with no remainder.
Since 6,289,056 cannot be divided by just 1 and 6,289,056, it is not a prime number.