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_56 (round_4 INTEGER, score VARCHAR, year VARCHAR)

### Question ###
What is the highest score in round 4 and total of 284 in a year more recent than 1998?

### Accurate SQL ###

SELECT MAX(round_4) FROM table_name_56 WHERE score = 284 AND year > 1998