How many prefectures have a population density of 16 people/kilometers squared?
CREATE TABLE table_221398_1 (pop_density___km²_ VARCHAR, number_in_map VARCHAR)
SELECT COUNT(pop_density___km²_) FROM table_221398_1 WHERE number_in_map = "16"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_221398_1 (pop_density___km²_ VARCHAR, number_in_map VARCHAR) Question: How many prefectures have a population density of 16 people/kilometers squared? [/INST] SELECT COUNT(pop_density___km²_) FROM table_221398_1 WHERE number_in_map = "16" </s>