All integers and fractions are rational numbers whereas an irrational number can't be expressed as an integer or a fraction.
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All real are rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Yes, a very small proportion are.
All integers are rational numbers. There are integers with an i behind them that are imaginary numbers. They are not real numbers but they are rational. The square root of 2 is irrational. It is real but irrational.
No, rational number are ones that can be written as a/b where a and b are integers. Irrational numbers are those real number that are NOT rational.
Every integer is a rational number, and some integers are perfect squares. These are the only rational numbers to have an integral square root.