Yes! Concrete pavers should be sealed. Paving stones are manufactured with the highest quality cement, but cement is a corrosive material that wears under natural elements.
The sun, rain and cold, can easily wear the surface of pavers, and a good sealing job with the right sealing product, applied by a professional technician of sealing, will create a layer of protection over the paving stones making them water repellent and weather proof. This will protect the concrete surface from corrosion.
A good sealer penetrates the paver surface and stays there for many years, even if the look of the sealer goes away, the color and texture of the pavers will stay new.