Is package a common noun

Yes, the noun package is a common noun, a Word for any package of any kind.

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

• Package Perfect (wedding and party goods), Atlanta, GA
• The Mail Boss Package Master (security mailboxes)
• "The Package", a novel by Glenn Crabtree
• "The Package", 1989 movie with Gene Hackman and Tommy Lee Jones