Q:

Newline in Multicolumn Breaking Document

If I try to add newlines by inserting the characters '\\' into the multicolumn it breaks the entire document. Is there any simple way to bypass this?
\begin{center}
\begin{tabular}{ | p{2.5cm} | p{4.5cm} | p{4cm} | p{3cm} | } 
\hline
Filename & File Location & MD5 Hash & Time Last Modified \\ 
\hline
\hline
sdfsdfsdf & fsdfsdf & de6a6b6319c edf4e91bc2065faf0 & 02/12/2008 \newline 14:57 \\

\hline
\multicolumn{4}{| p{14cm}| }{

Here are the numbers. This is a long text that may splits on several lines.

48053-5555-1234-5566 Zd10/19
48587.2545.5456.5555 FH96/29
44544 5588 5124 2458 5607/38

58872 8787 8787 4547 1078/38
55981-1574-6644-5567 691x/09
58743-2645-5684-4564 7D85/58
}\\
\hline
\end{tabular}
\end{center}

A:

Inside a tabular \\ has the meaning of "end the current tabular row" and not its default meaning in text "make a new line". 
You can instead use its long form which is \newline. 

