O seu visto de longa duração (mais de três meses) é abrangido pela categoria legal " Estadias Excedendo três meses ":
When you stay in an EU country for a long stay, usually for more than 90 days, you will generally be issued with a long-stay visa and/or a residence permit.
If your long-stay visa or residence permit has been issued by a Schengen area country, you can travel to another Schengen area country for 90 days per 180 day period. You must:
- justify the purpose of your stay;
- have sufficient financial resources for your stay and travel back;
- not be considered a threat to public policy, public security or public health.
You can also pass through other Schengen area countries on the way to your host country.
Então, nessa base, sim, você pode entrar nos outros estados Schengen, contanto que você siga esses termos com prazo limitado.