1.5 is a mixed number and there is no way to represent it as a whole number. The whole part of it is 1.
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Rounded to the nearest whole number, 14.82 is approximately equal to 15.
It is because a whole number multiplied by itself does not equal 15. An example of a square number is 49. 7 times 7 equals 49.
A number with nonzero digits after the decimal points is not a whole number, and it isn't equal to any whole number.
It IS a whole number!
15 is a whole number.