A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5245056 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 29 32 36 48 58 64 72 87 96 116 128 144 157 174 192 232 261 288 314 348 384 464 471 522 576 628 696 928 942 1,044 1,152 1,256 1,392 1,413 1,856 1,884 2,088 2,512 2,784 2,826 3,712 3,768 4,176 4,553 5,024 5,568 5,652 7,536 8,352 9,106 10,048 11,136 11,304 13,659 15,072 16,704 18,212 20,096 22,608 27,318 30,144 33,408 36,424 40,977 45,216 54,636 60,288 72,848 81,954 90,432 109,272 145,696 163,908 180,864 218,544 291,392 327,816 437,088 582,784 655,632 874,176 1,311,264 1,748,352 2,622,528 and 5,245,056, with no remainder.
Since 5,245,056 cannot be divided by just 1 and 5,245,056, it is not a prime number.