The Least Common Multiple $(LCM)$ of the smallest prime number and the smallest composite number is . . . . . . .

Find the smallest five-digit number which is exactly divisible by $15$,$55$,and $99$.

The $LCM$ of the smallest prime number and the smallest composite number is . . . . . . .

The $\text{g.c.d.}$ of two numbers is $18$ and their product is $6480$. Their $\text{l.c.m.}$ is ..........

The $\text{g.c.d.}$ (greatest common divisor) of two numbers is $16$ and their product is $3072$. Find their $\text{l.c.m.}$ (least common multiple).

Express the number $140$ as a product of its prime factors.