4 = 4/1 which is a ratio of two integers (4 and 1) where the second is not zero.
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-4 is a rational number
It is a rational number
Rational.
The square root of 4 is 2 which is a rational number
4 is a rational number. Any number is rational as long as it can be put into a fraction or ratio. In other words, 4 is a rational number because if you want to express 4 as a fraction, you would just put it over 1; 4 is the numerator, and 1 is the denominator in this case.