A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4606500 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 25 30 37 50 60 74 75 83 100 111 125 148 150 166 185 222 249 250 300 332 370 375 415 444 498 500 555 740 750 830 925 996 1,110 1,245 1,500 1,660 1,850 2,075 2,220 2,490 2,775 3,071 3,700 4,150 4,625 4,980 5,550 6,142 6,225 8,300 9,213 9,250 10,375 11,100 12,284 12,450 13,875 15,355 18,426 18,500 20,750 24,900 27,750 30,710 31,125 36,852 41,500 46,065 55,500 61,420 62,250 76,775 92,130 124,500 153,550 184,260 230,325 307,100 383,875 460,650 767,750 921,300 1,151,625 1,535,500 2,303,250 and 4,606,500, with no remainder.
Since 4,606,500 cannot be divided by just 1 and 4,606,500, it is not a prime number.