Is 2-Methyl-1-Propene the Correct Naming for this Molecule?

[quicksilver123]

I've attached the image. Is the naming of this molecule correct? If so, why is the methyl prefix necessary? The three carbon chain + the double bond makes it 1-propene...

If not, would the correct name be methylethene?

 

[Traxfam]

propene is the correct name the 1 is not necessary, more commonly it is known as propylene

 

[quicksilver123]

Thanks. So methylethene=propene?

 

[Traxfam]

Not quite, it is just propene 3 carbons one double bond. I am not sure where the methyl propene came from. 2-Methyl propene would have four carbons it is also known as isobutylene, here is a link

http://en.wikipedia.org/wiki/Isobutylene