Fill in the number according to the rule: 1, 4, 9, 16, 25______ ,49,64.

Fill in the number according to the rule: 1, 4, 9, 16, 25______ ,49,64.

6 × 6 = 36, so the sequence is: 1, 4, 9, 16, 25, 36, 49, 64