A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5578560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 30 32 36 39 40 45 48 52 60 64 65 72 78 80 90 96 104 117 120 130 144 149 156 160 180 192 195 208 234 240 260 288 298 312 320 360 390 416 447 468 480 520 576 585 596 624 720 745 780 832 894 936 960 1,040 1,170 1,192 1,248 1,341 1,440 1,490 1,560 1,788 1,872 1,937 2,080 2,235 2,340 2,384 2,496 2,682 2,880 2,980 3,120 3,576 3,744 3,874 4,160 4,470 4,680 4,768 5,364 5,811 5,960 6,240 6,705 7,152 7,488 7,748 8,940 9,360 9,536 9,685 10,728 11,622 11,920 12,480 13,410 14,304 15,496 17,433 17,880 18,720 19,370 21,456 23,244 23,840 26,820 28,608 29,055 30,992 34,866 35,760 37,440 38,740 42,912 46,488 47,680 53,640 58,110 61,984 69,732 71,520 77,480 85,824 87,165 92,976 107,280 116,220 123,968 139,464 143,040 154,960 174,330 185,952 214,560 232,440 278,928 309,920 348,660 371,904 429,120 464,880 557,856 619,840 697,320 929,760 1,115,712 1,394,640 1,859,520 2,789,280 and 5,578,560, with no remainder.
Since 5,578,560 cannot be divided by just 1 and 5,578,560, it is not a prime number.