What is the determinant of a square matrix whose entry or element is digit or number.

For example (100).
Please tell me method of finding the determinant of this matrix.

I am not sure that I understand your question but here is the general method:

http://people.richland.edu/james/lecture/m116/matrices/determinant.html

To find the determinant of a square matrix, you can follow these steps:

Step 1: Write down the given matrix.

For example, we have the matrix:
100

Step 2: The determinant of a 1x1 matrix is simply the value of the single element. So, in this case, the determinant is 100.

The process is straightforward for a 1x1 matrix since there is only one element.