Does Ichigo become a hollow

Answer 1

yes he had to in order to become a shinigami again

also he became a hollow during his vizard training and when orihime was screaming for help from him

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Yes, Ichigo has an inner hollow which he got, when trying to get his lost shinigami powers back in Urahara Shop.

Ichigo becomes a hollow when he loses his temper or when he looses too much reitsu as his inner hollow looks for a moment when his behaviour is volatile.

He becomes a hollow in Byakuga fight. Then again when Yammy and Ulquiorra visit Karakura town. After that he goes to training for controlling his hollow power with the Visoreds (Visards) namely Shinji, Hiyori and co. There he is able to control his hollow power for only a few seconds.

When he fights Grimmjow(6th Espada) in Heuco Mundo he perfects hollowfication which enables him settle in hollow form for a long time.

In his battle with Ulquiorra(4th Espada), he undergoes complete hollowfication when he passes out due to injuries and devastates Ulquiorra in his 2nd resurrected form.

He also loses is shinigami powers closer to when he fights Aizen. He turns into Getsuga and uses the Final Getsugatensha.

By this time he thinks he has defeated Aizen, but in the end Urahara comes in and the seal he implanted earlier on activates and destroys Aizen. (or so we think)

Now we think Ichigo only has Hollow powers but he may get his shinigami powers back later. But at least he has mastered how to fully hollofy at will. (As in fully hollofy I mean turn into the form he unwillingly turned into when he was fighting Ulquiorra)