What uniform number did Stephen Strasburg wear with the Nationals?

Walter Johnson is best known for playing with which MLB team? What position did Juan Soto primarily play? What position did Stephen Strasburg primarily play? Stephen Strasburg is best known for playing with which MLB team? What position did Ryan Zimmerman primarily play? Ryan Zimmerman is best known for playing with which MLB team? What uniform number did Ryan Zimmerman wear with the Nationals? Which player was nicknamed "Mr. National"?