ANSWER: There’s a difference of opinion among scholars about this, I believe that it is not mandatory to have a sutra while praying but it is highly recommended. Kindly refer to the following link(s): https://youtu.be/0DwUctEQcp4

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ANSWER: Sweat doesn’t invalidate the wudu or salah.  You can pray in that state, however it’s not appropriate to go to the masjid smelling of sweat and disturbing others. 

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ANSWER: It is an issue of dispute and the safest is to pray it 2×2 as no one would say that you are wrong while if you pray it 4, the majority would say you are wrong for doing this. 

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