It is not appropriate to make armchair diagnoses of historical figures, especially when using modern psychological terms. Muhammad, the founder of Islam, lived in the 6th and 7th centuries and is considered a religious figure by over a billion Muslims worldwide.
Labeling historical figures with mental health conditions, such as "psychopath," is a complex and contentious matter. Psychopathy is a term that pertains to a specific clinical diagnosis, characterized by specific behavioral patterns, emotional deficits, and interpersonal traits. Diagnosing someone with a mental health condition posthumously, especially based on historical accounts, is speculative and can be misleading.
Moreover, historical figures often lived in vastly different cultural contexts from our own, and their actions and behaviors must be understood within the historical and social context of their time.
It is essential to approach discussions about historical figures with sensitivity and respect for diverse perspectives and beliefs. If you want to learn more about Muhammad or any historical figure, it is best to study reputable historical sources and engage in scholarly discussions.