$\text { If } m \text { and } n \text { are integers, is } 6 m ^ { 2 } + 34 n - 18 \text { an even integer?}$

$\text { If } m \text { and } n \text { are integers, is } 6 m ^ { 2 } + 34 n - 18 \text { an even integer?}$
Justify your answer