Could my 4 year old be gifted?

He could be gifted or he could be academically motivated. Both types are high performers. I have known kids entering Kindergarten reading chapter books that don't qualify as gifted. Anyhow, just continue to provide him opportunities to grow in areas he is interested in. Doesn't sound as if he will struggle. Do keep in mind that gifted children do tend to lag behind in either social or emotional growth so don't overlook that.