In general, no, scholarship recipients do not have to pay back for the award received.
Note that most scholarships are granted as a reward to acknowledge the recipients' achievements (e.g. academic merit, sports) or conditions (e.g. financial need) and not given out as a loan to be repaid. However, scholarship providers may have the right to revoke the scholarship or to request for compensation, only when the recipients  breached the terms and conditions as stipulated in the scholarship agreement.
Examples of breaches in scholarship agreements are:
Scholarships with employment bond : If the scholarship recipient quits his/her studies halfway or breaks the employment bond early, he/she may be required to compensate the scholarship provider for the cost invested to-date.
Scholarships with compulsory progression: If the scholarship recipient does not continue his/her Bachelor's degree studies in the same institution (i.e. the scholarship provider), then he/she is required to pay back the scholarship amount received during his foundation or diploma studies.