He studied at the School of Fine Arts (1948-1952) under Umvertos Argyros, Dimitrios Biskinis and Andreas Georgiadis while in 1963, on a six month scholarship from the French government, he did post-graduate work in Paris.
His artistic activity includes solo presentations and appearances in group and international exhibitions, such as the Youth Biennale of Paris in 1959, and the Sao Paolo and Alexandria Biennales of 1965 and 1968 respectively, at which he repeatedly won distinctions.
A multifaceted creator, Prekas has been involved with painting, sculpture, decorative design and architectural ornamentation, making compositions for the interior and exterior spaces of apartment buildings and other public and community buildings. In painting he was originally involved with landscape while later, combining Greek reality with myth and tradition, he created thematic wholes which reflect the spirit of constructivism and abstraction. He has used similar motifs in his sculpture, with a combination of abstract, cubist and expressionist elements