The smallest positive divisor greater than $1$ of a composite number $a$ is

The number of integers $q$,$1 \leq q \leq 2021$,such that $\sqrt{q}$ is rational and $\frac{1}{q}$ has a terminating decimal expansion,is

Let $N$ be the least positive integer such that whenever a non-zero digit $c \in \{1, 2, \dots, 9\}$ is written after the last digit of $N$,the resulting number is divisible by $c$. The sum of the digits of $N$ is:

If the number of terms in the expansion of ${\left( {1 - \frac{2}{x} + \frac{4}{{{x^2}}}} \right)^n}, x \ne 0$ is $28$,then the sum of the coefficients of all the terms in this expansion is:

The number of positive divisors of $360$ which are multiples of $3$ is

If $n$ is a factor of $72$,such that $xy = n$,then the number of ordered pairs $(x, y)$ is: (where $x, y \in N$)