A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4300500 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 25 30 47 50 60 61 75 94 100 122 125 141 150 183 188 235 244 250 282 300 305 366 375 470 500 564 610 705 732 750 915 940 1,175 1,220 1,410 1,500 1,525 1,830 2,350 2,820 2,867 3,050 3,525 3,660 4,575 4,700 5,734 5,875 6,100 7,050 7,625 8,601 9,150 11,468 11,750 14,100 14,335 15,250 17,202 17,625 18,300 22,875 23,500 28,670 30,500 34,404 35,250 43,005 45,750 57,340 70,500 71,675 86,010 91,500 143,350 172,020 215,025 286,700 358,375 430,050 716,750 860,100 1,075,125 1,433,500 2,150,250 and 4,300,500, with no remainder.
Since 4,300,500 cannot be divided by just 1 and 4,300,500, it is not a prime number.