Does Inverting Op Amp Require Buffer at Output to Prevent Influence from Load
An ideal opamp has zero output impedance and infinite drive capabiilty, so will not be affected by any following load.

"Real" opamps have finite output impedance and drive.
ANY load will affect them somewhat, no matter how small.
But if the circuit is designed to allow for the non idealities, which is a fundamental part of the design process, then in many cases no buffer is required. 

In cases of significant load which cause obvious and undesirable effects a buffer may be a good solution - noting that adding one has its own effects which need to be taken account of.

An opamp in a non inverting circuit may also suffer load effects which make a buffer useful.