How old is he?
Its just hard to know.
My DD has no interest in playing with or being near other kids. She was delaye in language but has caught up now at 3. Except she does not speak in social situations. She goes to a self contained preschool for her issues.
She also does not play with toys correctly (as in feeding a baby doll, cooking food etc). She just organizes things.
If he is playing well with other kids and learning social rules as he seeks out others then he may not be on the spectrum.