We present dynamical status of the Galactic globular cluster NGC 6656 using spatial distribution of Blue Straggler Stars ( BSSs ) . A combination of multi-wavelength high-resolution space and ground-based data are used to cover a large cluster region . We determine the centre of gravity ( C _ { grav } ) and construct the projected density profile of the cluster using the probable cluster members selected from HST and Gaia DR2 proper motion data sets . The projected density profile in the investigated region is nicely reproduced by a single mass King model , with core ( r _ { c } ) and tidal ( r _ { t } ) radius as 75 \arcsec . 2 \pm 3 \arcsec . 1 and 35 \arcmin . 6 \pm 1 \arcmin . 1 respectively . In total , 90 BSSs are identified on the basis of proper motion data in the region of radius 625 \arcsec . An average mass of the BSSs is determined as 1.06 \pm 0.09 M _ { \sun } and with an age range of 0.5 to 7 Gyrs . The BSS radial distribution shows a bimodal trend , with a peak in the centre , a minimum at r \sim r _ { c } and a rising tendency in the outer region . The BSS radial distribution shows a flat behaviour in the outermost region of the cluster . We also estimate A ^ { + } _ { rh } parameter as an alternative indicator of the dynamical status of the cluster and is found to be 0.038 \pm 0.016 . Based on the radial distribution and A ^ { + } _ { rh } parameter , we conclude that NGC 6656 is an intermediate dynamical age cluster .