  Germanene has emerged as a novel two-dimensional material with various
interesting properties and applications. Here we report the possibility of
superconductivity in a stable potassium intercalated germanene compound,
KGe$_2$, with a transition temperature $T_c \sim 11$ K, and an electron-phonon
coupling of 1.9. Applying a 5\% tensile strain, which reduces the buckling
height by 4.5\%, leads to the reduction of the electron-phonon coupling by 11\%
and a slight increase in $T_c \sim 12$ K. That is, strong electron-phonon
coupling results from the buckled structure of the germanene layers. Despite
being an intercalated van der Waals material similar to intercalated graphite
superconductors, it does not possess an occupied interlayer state.
