Is Saipan Part of the Hawaiian Islands?

No. Saipan and the Island of Hawaii are in completely different Pacific archipelagos.

• Saipan is the largest island of the Northern Mariana Islands, a US Commonwealth in the western Pacific, about 3,800 miles west of Hawaii.
• The Island of Hawaii ("Big Island") is the largest and youngest of the Hawaiian Islands, a US state in the central Pacific.

They differ geologically, politically, culturally, and by thousands of miles.