CREATE TABLE table_name_62 (prom__m_ INTEGER, height__m_ VARCHAR(255), class VARCHAR(255), peak VARCHAR(255))
Tell me the lowest prom for class of hewitt and peak of cushat law and height more than 615
    
SQL: SELECT MIN(prom__m_) FROM table_name_62 WHERE class = "hewitt" AND peak = "cushat law" AND height__m_ > 615