No. Any number that has a finite number of digits if RATIONAL.
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The product of two irrational numbers may be rational or irrational. For example, sqrt(2) is irrational, and sqrt(2)*sqrt(2) = 2, a rational number. On the other hand, (2^(1/4)) * (2^(1/4)) = 2^(1/2) = sqrt(2), so here two irrational numbers multiply to give an irrational number.
Rational number can be divided into more that the number 2. Irrational number are numbers that can only be divided evenly with the number 2.
2 is a prime number and its square root is an irrational number that cannot be expressed as a fraction
No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.
Sqrt(2) is irrational. Multiply by sqrt(4.5). Result is 3 which is rational.