The Precision command returns the number of digits of precision in the specified number.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{Precision}\left(3746.983784769301\right)$

$15$

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

$\mathrm{FromMma}\left(\mathrm{`Precision[3746.983784769301]`}\,\mathrm{evaluate}\right)$

$15$