Answer
$m = 1.49 \times 10^4 MeV/c^2$
Work Step by Step
To convert the unit from $u$ to $MeV/c^2$, use the conversion factor $1 \space u = 931.49 MeV/c^2$
$m = 15.994 914 6 u \times \frac{931.49 MeV/c^2}{1 \space u}$
$m = 1.49 \times 10^4 MeV/c^2$
