When the whole number is a perfect square, ie it is a whole number squared.
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No. The square root of a positive integer is either a whole number or it is irrational.
The square root of 29 is an irrational number.
The √49 is 7. It is a rational number.
No. In general, the square root of a positive integer is either a whole number, or an irrational number.
The negative square root of 49 is -7. -7 is whole, integer, and rational number. It's not a natural or irrational number.