If a number is to the power of 2 it is "squared". The number that is squared is the "root".
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If you multiply a number by itself, you can also call it the square of the number, the second power of the number, or the number to the power 2.
a number to the power of 2 is that number squared. It is abbreviated as number with 2 as the exponent, or the number with 2 superscript after it.
Any number to the power of one is the number itself. On this note, 2 to the power of 1 is 2.
For an exact power of 2 (1, 2, 4, 8, 16, 32, etc., but also 1/2, 1/4, etc.), you can try out different exponents until you get it right. To write any number (greater than 0) as a power of 2 is equivalent to taking the logarithm of that number in base 2, which is the same (if you call your number "n") as calculating log n / log 2 (using the same base for both logarithms - for example, both in base 10, or both in base e).
multiplying a number by itself is a power 2^2=2 to the 2nd power 2^3=2 to the 3rd power