Replace $*$ by the largest digit to make $724*24$ divisible by $9$.

Replace $*$ by the largest digit to make $724*24$ divisible by $11$.

Write the greatest three-digit number which is divisible by $2$ and $5$.

Write the greatest four-digit number which is divisible by $8$.

Write the smallest $4$-digit number which is divisible by $3$(digits are not to be repeated).

The smallest prime number is

Numbers having more than two factors are called

A number is divisible by $3$ if

If the sum of the digits of a number is subtracted from the number, then the resulting number is always divisible by