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_name_38 (round INTEGER, position VARCHAR, pick__number VARCHAR)

### Question ###
What is the sum of the round of the player who plays linebacker and has a pick # greater than 251?

### Accurate SQL ###

SELECT SUM(round) FROM table_name_38 WHERE position = "linebacker" AND pick__number > 251