Is magazines a common noun

Yes, the Word 'magazines' is a common noun, the plural form of the noun magazine; a Word for any magazine of any kind.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Dr. Joanna Magazine DMD, Pinellas Park, FL
• Magazine, AR 72943
• Magazine Street, New Orleans, LA orMagazine Street, Cambridge, MA
• Time Magazine or Popular Science Magazine