Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26007767_1 (localities VARCHAR, population_density__per_km²_ VARCHAR)

### Question ###
How many time is the population density (per km²) is 2.5?

### Accurate SQL ###

SELECT COUNT(localities) FROM table_26007767_1 WHERE population_density__per_km²_ = "2.5"