No, it is not irrational as written, as long as it has not been previously rounded off
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Because 26 squared is 676 so the square root of 676 must be 26.
No. The sum of an irrational number and any other [real] number is irrational.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
26
If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.