Yes, you can downgrade from ios 7 beta back to 6.1.3. The steps involved can be followed through the related link added below
Go into the Settings app>General>Software Update>Download and Install.
Yes, it is! I just installed the iOS7 beta2 on my iphone 4s. It performs well on 4s. Actually, you can even install iOS7 on iphone4 and even 3GS. I heard the iOS7 is slow and stuck on iphone4 or earlier iphone edition. But it definitely works fine on 4s!
yes
it is coming this fall
some time in june
43.7857 times.
im not sure but i think only iphones and ipod touch 5th generation can get the ios7 update but im not sure.
You don't need a link. The download is embedded in your Settings app. You just go into Settings>General>Software Update.
Nope. Just the 5th Generation.
613 is a prime number.
You cannot change a computer into a phone
Only 1 and 613, as it is a prime number.Itself and one because 613 is a prime number