No it is a solid. It’s in fact an amorphous compound of silicon dioxide (sand). You can make glass ou of other things also and when you go into material chemistry the real definition gets a little difficult.
I think glass has some funny properties, but it’s ultimately a solid. There are actually quite a bit of different types of matter beyond solid, liquid or gas. There’s also plasma, bose-einstein condensate, fermi condensate… Depending on where you draw the lines, there can be others too. And there will always be something that doesn’t quite fit well into any categories.
Glass is like a liquid because the molecules in it are very random and disordered. Solids are usually more ordered. But it’s hard to think glass is much like water (apart from being transparent). But then a tomato is a fruit, apparently.