Answer :

the square root rounded up to the nearest integer, 6.
testing the values 1 through 6 for division into 36 we find factors of 36 which are : (1, 36)
(2, 18)
(3, 12)
(4, 9)
(6,6)
or in other words the sets would be : 1, 2 , 3, 4 , 6 , 9 , 12 , 18 , 36
1 and 36), (2 and 18), (3 and 12), (4 and 9), (6 and 6) or the set 1, 2, 3, 4, 6, 9, 12, 18, 36.