Is the square of a negative number positive or negative?

Is the square of a negative number positive or negative?

As long as it is a real number, its square is positive. Of course, the square of a negative number is also positive

Why is the square of a negative number a positive number, and is the square of 2 under a negative cubic root a positive number?

The square of any real number is not negative, and the square of a pure imaginary number is negative

The reciprocal of a positive number is a positive number, and the reciprocal of a negative number is a negative number,

The reciprocal of a positive number is a positive number, and the reciprocal of a negative number is a negative number
A positive number, a negative reciprocal is a negative number, wrong