1 MEDIUM Which of the following is a composite number? $$1$$$$3$$$$5$$$$7$$$$9$$

 2 MEDIUM Which of the following is NOT a prime number? 27146492391131

 3 MEDIUM Which of the following is a square number? $$19$$$$29$$$$39$$$$49$$$$59$$

 4 MEDIUM What is the largest composite number less than 60?

 5 MEDIUM What is the square of 7?