No - numbers are neither irrational nor rational.
Ans 2
Well, it is true that 21 is not irrational.
As to being rational, every integer is rational.
Proof : Take an integer n, add it to itself.
Now look at (n+n)/2. It is obviously rational, but equally obviously it reduces to n.
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No. The square root of an integer is either an integer, or an irrational number.
You wont be able to add a rational number and an irrational number and get a number not in a fraction ( 3 + 22/7) (21/7 + 22/7 = 43/7) So, yes as you see in the example above it made another irrational number.
At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.
it is a rational number but 4.121314..... is an irrational no
An irrational number.