Is an 89 blazer a square body?

Yes, the 1989 Chevrolet Blazer is considered a "square body" vehicle. The term "square body" typically refers to Chevrolet and GMC trucks and SUVs produced from 1973 to 1987, but the Blazer continued to share similar design elements into the late '80s. Therefore, while the '89 Blazer has some differences from earlier models, it is often included in the square body category due to its overall design aesthetic.