Answer
$554 mK/s = 554\times10^{-3} K/s$ = $554 µK/ms$
Work Step by Step
1) $554 \frac{mK}{s} \times \frac{K}{1000mK} = 0.554 K/s$
2)$ 554\frac{mK}{s} \times\frac{K}{1000mK} \times \frac{10^{6} µK}{K}\times\frac{s}{1000ms} = 554 µK/ms$
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