4216 = 3 (number of perfect square in the number i.e. 4, 1, 16)
1211 = 4 (number of perfect square in the number 1, 121, 1, 1)
9164 = 5 (number of perfect square in the number 9, 1, 16, 64, 4, 1
Similarly
1649 = 6 (Perfect squares in the number are - 1, 16, 4, 64, 49, 9)