\documentclass{article}
\begin{document}
\begin{tabular}{|c|c|c|c|}
\hline
1 & \multicolumn{3}{p|}{ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg} \\
\hline
2 & 2 & 2 & 2 \\
\hline
\end{tabular}
\end{document}