Prague is about 1.3 times bigger than Saint Vincent and the Grenadines.

Saint Vincent and the Grenadines is approximately 389 sq km, while Prague is approximately 496 sq km, making Prague 28% larger than Saint Vincent and the Grenadines.
Tip: This to-scale comparison of Saint Vincent and the Grenadines vs. Prague uses the Mercator projection, which distorts the size of regions near the poles.