A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5592864 can be evenly divided by 1 2 3 4 6 8 12 16 17 23 24 32 34 46 48 51 68 69 92 96 102 136 138 149 184 204 272 276 298 368 391 408 447 544 552 596 736 782 816 894 1,104 1,173 1,192 1,564 1,632 1,788 2,208 2,346 2,384 2,533 3,128 3,427 3,576 4,692 4,768 5,066 6,256 6,854 7,152 7,599 9,384 10,132 10,281 12,512 13,708 14,304 15,198 18,768 20,264 20,562 27,416 30,396 37,536 40,528 41,124 54,832 58,259 60,792 81,056 82,248 109,664 116,518 121,584 164,496 174,777 233,036 243,168 328,992 349,554 466,072 699,108 932,144 1,398,216 1,864,288 2,796,432 and 5,592,864, with no remainder.
Since 5,592,864 cannot be divided by just 1 and 5,592,864, it is not a prime number.