  We explore the nonlinear properties of IGR J17091-3624 in the line of the
underlying behaviour for GRS 1915+105, following correlation integral method.
We find that while the latter is known to reveal the combination of fractal (or
even chaotic) and stochastic behaviours depending on its temporal class, the
former mostly shows stochastic behaviour. Therefore, although several
observations argue IGR J17091-3624 to be similar to GRS 1915+105 with common
temporal classes between them, underlying nonlinear time series analyses offer
differently. Nevertheless, the Poisson noise to $rms$ variation value for IGR
J17091-3624 turns out to be high, arguing them to be Poisson noise dominated
and hence may plausibly lead to suppression of the nonlinear character, if any.
Indeed, it is a very faint source compared to GRS 1915+105. However, by
increasing time bin some of the temporal classes of IGR J17091-3624 show
deviation from stochasticity, indicating plausibility of higher fractal
dimension. Along with spectral analysis, overall IGR J17091-3624 argues to
reveal three different accretion classes: slim, Keplerian and advective
accretion discs.
