No. 4 over 4, or 1 whole, is not an irrational number. It can be written as a simple fraction, 4/4, so it is not an irrational number.
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No, an irrational number by definition is a number that cannot be written as a fraction
-4 is a rational number
The square root of 3 is an irrational number
No.
If you multiply or divide an irrational number - such as pi - by ANY rational number (except zero), you will ALWAYS get an irrational number.