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Prime number
Yes the number is raised to the second power
=One Binary number by itself is called a Bit.=
An exponent is used to indicate that a number is multiplied by itself a specified number of times. For example, to multiply 4 by itself 9 times, you would write 49.
The square root of any negative number is not even a 'real' number. It's called 'imaginary', because there's no number you can multiply by itself to get a negative number. The square root of 101 is irrational.