Is it obligatory to repeat the prayer when there is recurring doubt about the insufficiency of prostrations (sujud) in the first and last rak'ahs, knowing that the greater number was acted upon in accordance with the abundance of whispers (waswas)?

The one afflicted by waswas (obsessive doubts) should turn away from these whispers and not pay attention to them. If he doubts in his prayer whether he performed one prostration or two, he should consider them two prostrations, regardless of whether his doubt in prayer is repeated or not. Turning away from waswas and ignoring them is the correct and necessary approach until Allah removes them.