The answer depends on your calculator but many have shortcut keys for "x10x" or something similar.
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There is usually a key labelled 10x or *10x or Ex where the last letter is in superscript. Enter the mantissa of the number, then press this key followed by the exponent.
because some numbers are tooo big for the screen so the calculator puts it in scientific notation form
It is the use of scientific notation.
On most calculator there's a 'ENG' key
Try it on your scientific calculator. It will say 2.5e+4.
Some calculators have a "x10x" button.