Writing table side by side in Latex

Question

How to write these two tables side by side. I go through with that but \quad is not working. Please Help.

\renewcommand{\arraystretch}{1.5}
\begin{tabular}{ | m{1.5cm} | m{.75cm}| m{.75cm} |  m{.75cm}| m{.75cm}| m{.75cm} |  m{.75cm}| m{1.5cm} |}

\hline
\textbf{prime $p$:}  & $p_1$ & $p_2$ & $p_3$ & $p_4$ & $p_5$ & ... & $p_n < B_m$ \\ 

\hline
\end{tabular}\
\quad
\centering
\renewcommand{\arraystretch}{1.5}
\begin{tabular}{ | P{1.25cm} | P{2cm}|}
\hline
$p^{'}_1$  & $r_{1}^{1}$, $r_{1}^{1}$  ,$r_{1}^{1}$  ,$r_{1}^{1}$  \\
.  & . \\
$p^{'}_1$  & $r_{1}^{1}$, $r_{1}^{1}$  ,$r_{1}^{1}$  ,$r_{1}^{1}$  \\
$p^{'}_1$  & $r_{1}^{1}$, $r_{1}^{1}$  ,$r_{1}^{1}$  ,$r_{1}^{1}$  \\

\hline
\end{tabular}

Answer 1

I am not entirely certain, but this answer supports my intuition/belief that \centering starts a new paragraph, or at least a new line. That is why your tables don't appear next to each other. I also fail to see the purpose of \centering in your code fragment. Maybe you want it before the first table, so that the entire construct of your two tables is centered. In that case you can solve two problems at once, by moving \centering before your first table.