when was this museum established?
1819.
Museo del Prado
Founded as a museum of paintings and sculpture in 1819, it also contains important collections of other types of works. 
what is the entombment? It is a glue-size painting on linen. who is the painter? Dieric Bouts. does it have a theme? It shows a scene from the biblical entombment of Christ. when was it created? Between 1440 and 1455. can you name some other works of this painter? "Triptych of the Virgin's Life" and "Altarpiece of the Holy Sacrament". is any of these painting kept in a museum? Yes, the "Triptych of the Virgin's Life" is in the collection of the Museo del Prado.
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Museo del Prado [SEP] Introduction
The Prado Museum ( ; ), officially known as Museo Nacional del Prado, is the main Spanish national art museum, located in central Madrid. It is widely considered to have one of the world's finest collections of European art, dating from the 12th century to the early 20th century, based on the former Spanish Royal Collection, and the single best collection of Spanish art. Founded as a museum of paintings and sculpture in 1819, it also contains important collections of other types of works. The Prado Museum is one of the most visited sites in the world, and it is considered one of the greatest art museums in the world.