A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4317560 can be evenly divided by 1 2 4 5 8 10 13 19 20 23 26 38 40 46 52 65 76 92 95 104 115 130 152 184 190 230 247 260 299 361 380 437 460 494 520 598 722 760 874 920 988 1,196 1,235 1,444 1,495 1,748 1,805 1,976 2,185 2,392 2,470 2,888 2,990 3,496 3,610 4,370 4,693 4,940 5,681 5,980 7,220 8,303 8,740 9,386 9,880 11,362 11,960 14,440 16,606 17,480 18,772 22,724 23,465 28,405 33,212 37,544 41,515 45,448 46,930 56,810 66,424 83,030 93,860 107,939 113,620 166,060 187,720 215,878 227,240 332,120 431,756 539,695 863,512 1,079,390 2,158,780 and 4,317,560, with no remainder.
Since 4,317,560 cannot be divided by just 1 and 4,317,560, it is not a prime number.