A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4577580 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 49 54 60 63 70 84 90 98 105 108 126 135 140 147 173 180 189 196 210 245 252 270 294 315 346 378 420 441 490 519 540 588 630 692 735 756 865 882 945 980 1,038 1,211 1,260 1,323 1,470 1,557 1,730 1,764 1,890 2,076 2,205 2,422 2,595 2,646 2,940 3,114 3,460 3,633 3,780 4,410 4,671 4,844 5,190 5,292 6,055 6,228 6,615 7,266 7,785 8,477 8,820 9,342 10,380 10,899 12,110 13,230 14,532 15,570 16,954 18,165 18,684 21,798 23,355 24,220 25,431 26,460 31,140 32,697 33,908 36,330 42,385 43,596 46,710 50,862 54,495 65,394 72,660 76,293 84,770 93,420 101,724 108,990 127,155 130,788 152,586 163,485 169,540 217,980 228,879 254,310 305,172 326,970 381,465 457,758 508,620 653,940 762,930 915,516 1,144,395 1,525,860 2,288,790 and 4,577,580, with no remainder.
Since 4,577,580 cannot be divided by just 1 and 4,577,580, it is not a prime number.