  The analyses of the LHCb data on $X(6900)$ found in di-$J/\psi$ and $J/\psi
\psi(3686)$ systems are performed using a momentum-dependent {Flatt\'{e}}-like
parameterization. The use of the pole counting rule and spectral density
function sum rule give consistent conclusions that $X(6900)$ may not be a
molecule of $J/\psi \psi(3686)$. Nevertheless it is still possible that
$X(6900)$ be a molecule of higher states, such as $J/\psi\psi(3770)$,
$\chi_{c0}\chi_{c2}$, etc.
