  The analysis of the LHCb data on $X(6900)$ found in the di-$\jpsi$ system is
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 both confining states and molecular states are
possible, or it is unable to distinguish the nature of $X(6900)$, if only the
di-$\jpsi$ experimental data with current statistics are available.
Nevertheless, we found that the lowest state in the di-$J/\psi$ system has very
likely the same quantum numbers as $X(6900)$, and $X(6900)$ is probably not
interpreted as a $J/\psi-\psi(2S)$ molecular state.
