You can't determine that from the form itself. You may be able to find out by contacting the payer of Form 1099-DIV, but that may not be helpful.
In Box 5, Section 199A Dividends on page 4 of the Instructions for Form 1099-DIV, the IRS instructs the Form 1099-DIV preparer:
"Include REIT dividends (other than capital gain dividends and qualified dividends) for which it is impractical for the REIT to determine whether the recipient has met the holding period requirement described in Regulations section 1.199A-3(c)(2)(ii)."
In other words, Box 5 can include amounts that the payer has no idea about how they should be treated insofar as the holding period is concerned.
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