I believe so. Unfortunately I only have the bottom portion of the check stub which only has information for box 1 and 2a.
That sounds like a portion of a 1099-R form. You need the entire form with the box 7 code to report it in addition to box 1 and 2a. Ask the plan administrator for a copy. Box 4 also if any tax was withheld.
Who issued the check? You need a 1099-R if it was for a 401K.
A previous employer that I worked for a during 2015-2016. They recently filed for bankruptcy and I am concerned I will be unable to get the form in a timely matter if at all.
As noted by TurboTaxDawnC and SuperUser macuser_22, you must contact the financial institution that issued the check to you to ask for another copy of the Form 1099-R. (This is usually not the same business as the company where you worked.)
If you cannot get another copy of your Form 1099-R, you can create a substitute Form 1099-R within TurboTax and enter the information to the best of your knowledge. There is a check-box on the screen where you choose what type of Form 1099-R you are entering that is labeled “I need to prepare a substitute 1099-R”. Be sure to check that box and proceed.
The information below is from TurboTax help content. It tells you more about filling out the substitute 1099-R and other requirement you must meet in order to use the substitute form.
Form 4852, Substitute for Form 1099-R, Distributions from Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, Etc.
Substitute Form 1099-R
If your plan administrator doesn't give you Form 1099-R for 2017 (or the one you receive is wrong and your plan administrator refuses to correct it), do your best to obtain the form or correction before completing a substitute on Form 4852.