Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1688640_4 (car__number VARCHAR, year_started VARCHAR)
### Question:
Name the car number for 1997
### Answer:
SELECT car__number FROM table_1688640_4 WHERE year_started = 1997