It is: 2*2 = 4
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4 the way you work this is: 2*(sqrt)2^2 the square root cancels out the exponent, so your left with 2*2
The likely square numbers are 36 and 1. (6^2 - 1^2) However, the square numbers 324 and 289 also work. (18^2 - 17^2)
To check if your number is a square number, draw little dots. like, for 4 it will 2 dots by 2 dots. if this doesn't work equally, it is not a square number.
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
A trinomial is perfect square if it can be factored into the form (a+b)2 So a2 +2ab+b2 would work.