how to prepare a create table statement

do $$
declare
counter integer := 0;
begin
while counter <= 500 loop
    PREPARE create_table(int) AS
    CREATE TABLE mbk_auth_method_$1 PARTITION OF mbk_auth_method FOR VALUES WITH (modulus 500, remainder $1);
    EXECUTE create_table (counter);
    counter := counter + 1;
end loop;
end$$;

problem is that a CREATE TABLE cannot be prepared statement..