Any number that can be expressed as a fraction is a rational number otherwise it is an irrational number.
200.
The square root of 61.93 is irrational. Since rational numbers are infinitely dense there cannot be a closest rational.
It is rational.
One, and e.
No, it is irrational. Furthermore, it is transcendental.
The answer depends on who they are that possess rational numbers.
It is a rational number
It is a rational number. It can be written as a fraction.
yes
e^pi ~ 23.14069.............., not rational
1.96 is a rational number
It is a rational number.