The mtimes(M1,M2) function performs matrix multiplication of M1 * M2.  If either M1 or M2 is a scalar, then element-wise multiplication is performed instead.

$\mathrm{with}\left(\mathrm{MTM}\right)\:$

$\mathrm{M1}≔\mathrm{Matrix}\left(2\,3\,'\mathrm{fill}'=1\right)\:$

$\mathrm{M2}≔\mathrm{Matrix}\left(3\,2\,'\mathrm{fill}'=2\right)\:$

$\mathrm{mtimes}\left(\mathrm{M1}\,\mathrm{M2}\right)$

$\left[\begin{array}{cc}6& 6\\ 6& 6\end{array}\right]$