The square matrix have determinant because they have equal numbers of rows and columns.
<<>> Determinants are not defined for non-square matrices because there are no applications of non-square matrices that require determinants to be used.
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A determinant is defined only for square matrices, so a 2x3 matrix does not have a determinant.Determinants are defined only for square matrices, so a 2x3 matrix does not have a determinant.
The determinant is only defined for square matrices.
diagonal
If it is not a square matrix. You cannot invert a square matrix if it is singular. That means that at least one of the rows of the matrix can be expressed as a linear combination of the other rows. A simple test is that a matrix cannot be inverted if its determinant is zero.
The determinant will change sign.