2. [5] How many perfect squares divide $10^{10}$ ?
Answer:
$$
36
$$

A perfect square $s$ divides $10^{10}$ if and only if $s=2^{a} \cdot 5^{b}$ where $a, b \in\{0,2,4,6,8,10\}$. There are 36 choices, giving 36 different $s$ 's.