This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.
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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.
Each is half of the previous number, so 6.25 will be next.