Yes.
The definition of a surd is "an irrational number"
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Irrational numbers
No because surds are irrational numbers
They define irrational numbers
A surd is a number expressed as a square root (or some other root). Such roots are usually irrational; but irrational numbers also include other numbers, which CAN'T be expressed as the root of a rational number. For example, pi and e.
Surds are normally irrational numbers but they can be simplified for instance the square root of 12 can be expressed as 2 times the square root of 3