Answer
$10^{9}$ $millimeter^{3}$
Work Step by Step
$1$ $meter$ = $10^{3}$ $millimeter$
Hence, $1$ $cubic$ $meter$ = $1$ $meter^{3}$ = $(10^{3} millimeter)^{3}$
This becomes : $1$ $cubic$ $meter$ $=$ $10^{9}$ $millimeter^{3}$
$($$since$ $(a^{m})^{n}=a^{mn})$
Final result : $1$ $cubic$ $meter$ = $10^{9}$ $millimeter^{3}$