Do I have to repeat the prayers after discovering that the clear, flowing fluid that came out of me was semen, knowing that I thought it was prostatic fluid and it did not show the known characteristics of semen except for the flow?

"Al-madhy (pre-seminal fluid) and al-many (seminal fluid) may be similar in color and consistency, but they differ in smell and the degree of arousal. Al-madhy has no smell and is associated with minor arousal, whereas al-many has a smell and is associated with major arousal. If it becomes clear to you that what was discharged was al-many, then you must repeat the prayers you performed without ghusl (ritual bath). If you do not know their exact number, then make up what you believe is most likely to clear your conscience. There is also another opinion among some scholars that it is not obligatory to make up prayers for someone who omitted a condition of prayer out of ignorance. And it is permissible to act upon a less preferred opinion after the event has occurred to alleviate hardship."