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How do you draw a triangular prism like this in LaTex? Thank you

I also please need help in labeling all the vertices, thank you

Welcome to TeX.SE!

documentclass[tikz,border=3.14mm]{standalone}

begin{document}

begin{tikzpicture}

 draw[dashed,thick] (-1,0) -- (0,0.5) edge (0,2.5) -- (1,0);

 draw[thick] (-1,0) rectangle (1,2) -- (0,2.5) -- (-1,2);

end{tikzpicture}

end{document}

For more advanced applications I'd recommend tikz-3dplot or asymptote.

Some labels, as requested. Just to make sure: this is not a typesetting service. So please try doing something on your own!

documentclass[tikz,border=3.14mm]{standalone}

begin{document}

begin{tikzpicture}

 draw[dashed,thick] (-1,0) -- (0,0.5) edge (0,2.5) -- (1,0) coordinate(BR);

 draw[thick] (-1,0) coordinate(BL)  rectangle (1,2) coordinate(TR) 

 -- (0,2.5) coordinate(T) -- (-1,2) coordinate(TL);

 foreach X [remember=X as Y (initially TL),count=Z] in {BL,BR,TR,T,TL}

 {path (Y) -- (X) node[midway,anchor={90*Z-90-ifthenelse(Z==4,45,0)-ifthenelse(Z==5,45,0)}]{label Z}; }

end{tikzpicture}

end{document}

A nice solution with PSTricks.

documentclass[pstricks,12pt]{standalone}

usepackage{pst-eucl}

begin{document}

begin{pspicture}(8,10)

    pstGeonode[PosAngle={180,0,45}](1,1){A}(7,1){B}(4,4){C}(4,9){F}

    pstTranslation[PosAngle={180,0}]{C}{F}{A,B}[D,E]

    psline(E)(F)(D)(A)(B)(E)(D)

    psset{linestyle=dashed}

    psline(A)(C)(B)

    psline(C)(F)

end{pspicture}

end{document}