W2 box 12a code is DD and amount in box 12 = 3298.56. Not sure if I should enter this on return as ins. premiums paid from pre-tax dollars. Should I enter info or not?

You are correct.  These are insurance premiums paid through your employer.  This figure may be higher than the amount of premiums you actually paid, but, regardless, they have been paid with either your pre-tax funds or paid by the company.  Thus, if you are looking to receive a deduction for paying these premiums (whether this is on the Federal or State return), these amounts will not qualify for this deduction.