If number of columns and rows are not equal in a matrix then it is said to be a

If the number of rows and the number of columns of a matrix are equal and the matrix contains 25 elements, then the order of the matrix is _______

The number of column(s) in a column matrix are …………..

If the number of rows and that of columns of a matrix are equal and the matrix contains 16 elements, then the order of the matrix is _______