These look like a series of squares.
1 squared is 1, 2 squared is 4, 3 squared is 9, 4 squared is 16, 5 squared is 25 and then 6 squared is........36.
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This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.
If you mean: 1 4 9 16 25 then it is 36
The next square number after 16 is 25
The rule is 5 10 15 20 25 30 .... etc and accordingly the next number in the sequence will be 106
25 is the next number that appears in that sequence.