1.125 can't be a whole number.
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To the nearest whole number, 7
1125/1000 or 9/8
1125 = 3 x 3 x 5 x 5 x 5
A whole number is one without a decimal or fraction, and a natural number is any positive integer, so this is both a whole number and an integer.
1.125 = 1125/1000 = 9/8