【Question 1】Calculate: $5 \times 13 \times 31 \times 73 \times 137=$
$$
\begin{aligned}
5 \times 13 \times 31 \times 73 \times 137 & =(5 \times 13 \times 31) \times(73 \times 137) \\
& =2015 \times 10001 \\
& =20152015
\end{aligned}
$$

Translation:
$$
\begin{aligned}
5 \times 13 \times 31 \times 73 \times 137 & =(5 \times 13 \times 31) \times(73 \times 137) \\
& =2015 \times 10001 \\
& =20152015
\end{aligned}
$$