Complete the factor tree

Complete the factor tree

Write the prime factorisation of the largest $4$-digit number.

The number $15938*$ is divisible by $6$. The unknown non-zero digit marked as $*$ will be

$9*8071$ is divisible by $11$. The value of the missing digit is 

$7120$is not divisible by 

Which expression is the prime factorization of the smallest $5$-digit number?

In which of the following expressions, prime factorisation has been done ?

What least number should be subtracted from $26492518$ so that the resulting number is divisible by $3$,  but not by $9$?