Is Okasha a prophet or a prominent figure in Islam?

There is no prophet named Ukasha. The most prominent figure with this name is the esteemed Companion Ukasha ibn Mihsan al-Asadi, who was among the earliest converts and witnessed Badr. He is mentioned in the Two Sahihs (Bukhari and Muslim) in the hadith about the seventy thousand who will enter Paradise without reckoning, as the Prophet, peace and blessings be upon him, prayed for him to be among them. Ukasha was martyred fighting the apostates.