821 is a rational number
The number 821 is a prime number
Yes, 821 is a prime number.
820 is the number exactly between 819 and 821.
It is a rational number. It can be written as a fraction.
yes
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Is 12.05 a rational number or irrational number?
1.96 is a rational number
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.