First, if the 401(k), unless it was a Roth, would be deductible each year of contribution and tax free at that time. If you rolled it over into an IRA and the box is checked on your 1099-R, and you made no further contributions, there was never any nondeductible contributions.
The full amount is not a required minimum distribution (RMD), based on your age, if that is the question you refer to.
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