The Anglican denomination is thoroughly Protestant; yes there is an Anglo-Catholic sub-branch, and some High Anglican liturgical features may have the trappings of Catholicism, but the core and heart of Anglicanism is thoroughly Protestant. Indeed Anglicanism is not only Protestant, but firmly within the Reformed (Calvinist) side of Protestantism.
Let's start with the defining document of Anglican theology, the 39 Articles. The Articles that express Protestant theology and practice include:
Article 6: which declares the apocrypha/deuterocanon to be non-canonical, and non defining for doctrine.
Article 10: which teaches the Reformed view of free-will, that humans cannot by their own nature strength bring themselves to turn in faith towards God.
Article 11: which teaches justification by faith alone.
Articles 12-13: which says that our good works cannot put away sin, nor do they make us receive grace from God.
Article 14: which rejects the Catholic teaching of supererogation.
Article 17: which teaches the Reformed view of predestination and election.
Article 19: which says that the Roman church has erred in matters of both ceremony and faith.
Articles 20-21: which teach that the Church and the church councils have subordinate authority to the scriptures.
Article 22: rejects purgatory, icons, relics, and the invocation of saints.
Article 24: which says that it is repugnant to pray or minister the sacraments to the congregation in a language they don't understand, contra Roman practice of Latin liturgies.
Article 25: which limits the sacraments to only baptism and communion.
Article 28: which says transubstantiation is repugnant and contrary to scripture, as well as that the elements of communion are not to be gazed upon, lifted up, or carried around.
Article 30: which says both elements of communion are to be given to all congregants, against Catholic practice which normally only gives the laity the bread.
Article 31: which rejects any idea of priests offering Christ again.
Article 32: which allows clergy to marry.
Article 37: which says the Pope has no jurisdiction in England.
And beyond the 39 Articles, the Book of Common Prayer is also thoroughly Protestant, and although it is not an accepted or binding document for Anglicans, the Westminster Confession of Faith (and other Westminster documents), the defining English language Reformed Confession of Faith, was primarily written by Anglicans. I see no reasonable way to exclude Anglicanism from Protestantism.
No doubt you'll find some 'Anglicans' who disagree with much of the above; there have even been some high profile atheist Anglican priests and bishops. But those renegades do not define what it means to be Anglican so long as the 39 Articles remain the doctrinal standard for the denomination. And even today the numerical weight is behind conservative Anglicans, not theologically liberal Anglicans, just maybe not in England or the USA.