no, Uruguay was formerly held by Portugal, Spain, and Brazil.
Uruguay
The Portuguese. Spain colonized the rest of South America, other than Guyana, Suriname, and French Guiana. They gained what is roughly Brazil today from the Treaty of Tordesilla's with Spain, during the Iberian Union.
Portugal is a country in Europe with a boundary along Spain Brazil used to be a Portuguese colony, but it got it's independence in September the 17th, 1822
Portugal
Brazil was occupied by Portugal rather than Spain. French Guiana which isn't an independent country as such wasn't occupied by Spain.
The country of Portugal shares a border with Spain and the Atlantic Ocean. The two share the Iberian Peninsula. Portugal was a large exploration power and was granted Africa and even got Brazil in the process.
Ooooopps ! Brazil was a colony of Portugal, not Spain.
Portugal was the colonial ruler of Brazil when Brazil was a colony of Portugal.
Portugal
Brazil started as a colony of Portugal. The Treaty of Tordesillas divided the South American continent between Spain and Portugal, with Spain getting the western threequarters. However, Brazil expanded westwards and took large areas that should have been Spain's. The Spanish and the Portuguese empires in South America collapsed after independence movements in the early to middle 19th centuries, and the countries that we now know there gradually emerged.
Spain discovered and colonized Argentina Brazil discovered and colonized Brazil.