No. You can well multiply two Irrational Numbers and get a result that is not an irrational number.
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No, it is not. Root2 and root 8 are each irrational. Root8 / root2 =2. 2 is not a member of the set.
No. For example, the square root of two plus (minus the square root of two) = 0, which is not an irrational number.
No. sqrt(8) is irrational sqrt(2) is irrational but sqrt(8) /sqtr(2) = sqrt(4) = ±2 is not irrational.;
Rational numbers are closed under addition, subtraction, multiplication. They are not closed under division, since you can't divide by zero. However, rational numbers excluding the zero are closed under division.
They fall under "Real Numbers"