49, 36, 25 and 64 are all squares of whole numbers.
64 = 82
49 = 72
36 = 62
25 = 52
The square root of 72 is not a whole number, but approximately 8.48.
Thus 72 is the "odd one out".
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Square numbers 16, 25, 36, 49, 64, 81, 100
101
The perfect squares in the range are 25, 36 and 49.
1 + 4 + 16 + 25 + 36 + 49 = 131
.... 49, 36, 25, 16, 9, 4 and 1