Here is the definition of a full-time student in IRS Publication 970:
Full-time student. You are a full-time student for 2018 if during any part of any 5 calendar months during the year you were enrolled as a full-time student at an eligible educational institution (defined earlier), or took a full-time, on-farm training course given by such an institution or by a state, county, or local government agency.
If you paid tuition or received a scholarship from the college, you should get a Form 1098-T. On that Form 1098-T the Box 8 (at least a half-time student) will be checked if the college considered you a full-time student.
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