Yes, because there are multiple Romance languages spoken in Spain, and they’re all “Spanish” to people who live there. Castellano is the one spoken in Madrid, so it’s what the rest of the world thinks of as Spanish, kind of like how Mandarin is often referred to as Chinese even though other dialects are equally Chinese.
Well to be fair: Some regions in Spain really like to prefer to call it “Castellano”.
Yes, because there are multiple Romance languages spoken in Spain, and they’re all “Spanish” to people who live there. Castellano is the one spoken in Madrid, so it’s what the rest of the world thinks of as Spanish, kind of like how Mandarin is often referred to as Chinese even though other dialects are equally Chinese.