Yes.
2 Timothy 3:14-17 But as for you, continue in what you have learned and have firmly believed, knowing from whom you learned it and how from childhood you have been acquainted with the sacred writings, which are able to make you wise for salvation through faith in Christ Jesus. ALL Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
The Holy Spirit right here tells us that Scripture itself is adequate to THOROUGHLY equip EVERY man in order to be COMPLETE.
It's enough because God said it was enough.
It's not inadequate because the Catholic church says it's inadequate.
“Yes.”
Actually, no. That’s why even some Protestants have tacitly admitted that sola scriptura is assumed rather than an actual statement in scripture.
“ALL Scripture is breathed out”
That means scripture is inspired. That does not mean sola scriptura.
“by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.”
That means scripture can be used for training us in virtue. It does not mean sola scriptura in regard to doctrine, deciding doctrine, or the denial of sacred tradition.
http://matt1618.freeyellow.com/2tim316.html