A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3230766 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 27 33 37 42 49 54 63 66 74 77 81 98 99 111 126 147 154 162 189 198 222 231 259 294 297 333 378 407 441 462 518 539 567 594 666 693 777 814 882 891 999 1,078 1,134 1,221 1,323 1,386 1,554 1,617 1,782 1,813 1,998 2,079 2,331 2,442 2,646 2,849 2,997 3,234 3,626 3,663 3,969 4,158 4,662 4,851 5,439 5,698 5,994 6,237 6,993 7,326 7,938 8,547 9,702 10,878 10,989 12,474 13,986 14,553 16,317 17,094 19,943 20,979 21,978 25,641 29,106 32,634 32,967 39,886 41,958 43,659 48,951 51,282 59,829 65,934 76,923 87,318 97,902 119,658 146,853 153,846 179,487 230,769 293,706 358,974 461,538 538,461 1,076,922 1,615,383 and 3,230,766, with no remainder.
Since 3,230,766 cannot be divided by just 1 and 3,230,766, it is not a prime number.