25, 36, 49,64, 81, 100........
Each number is a square of 2, 3, 4, etc. so 5 squared is 25.
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16
16 is the next squared number.
It is: 1
The next number in the sequence is... 64
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.