A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4576500 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 27 30 36 45 50 54 60 75 81 90 100 108 113 125 135 150 162 180 225 226 250 270 300 324 339 375 405 450 452 500 540 565 675 678 750 810 900 1,017 1,125 1,130 1,350 1,356 1,500 1,620 1,695 2,025 2,034 2,250 2,260 2,700 2,825 3,051 3,375 3,390 4,050 4,068 4,500 5,085 5,650 6,102 6,750 6,780 8,100 8,475 9,153 10,125 10,170 11,300 12,204 13,500 14,125 15,255 16,950 18,306 20,250 20,340 25,425 28,250 30,510 33,900 36,612 40,500 42,375 45,765 50,850 56,500 61,020 76,275 84,750 91,530 101,700 127,125 152,550 169,500 183,060 228,825 254,250 305,100 381,375 457,650 508,500 762,750 915,300 1,144,125 1,525,500 2,288,250 and 4,576,500, with no remainder.
Since 4,576,500 cannot be divided by just 1 and 4,576,500, it is not a prime number.