A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4592588 can be evenly divided by 1 2 4 7 11 13 14 22 26 28 31 37 44 52 62 74 77 91 124 143 148 154 182 217 259 286 308 341 364 403 407 434 481 518 572 682 806 814 868 962 1,001 1,036 1,147 1,364 1,612 1,628 1,924 2,002 2,294 2,387 2,821 2,849 3,367 4,004 4,433 4,588 4,774 5,291 5,642 5,698 6,734 8,029 8,866 9,548 10,582 11,284 11,396 12,617 13,468 14,911 16,058 17,732 21,164 25,234 29,822 31,031 32,116 37,037 50,468 59,644 62,062 74,074 88,319 104,377 124,124 148,148 164,021 176,638 208,754 328,042 353,276 417,508 656,084 1,148,147 2,296,294 and 4,592,588, with no remainder.
Since 4,592,588 cannot be divided by just 1 and 4,592,588, it is not a prime number.