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Entering exponents is done by pushing the key labeled [EXP] or [EE] or [EEX].
Assuming the calculator can do exponents, take the number and raise it to the power of 1/2.
I think you are thinking "natural logarithm" which is ln (lowercase L, not I). If you have taken calculus you learn about logarithm and its relationship with exponents
Simply type in 2500000. In scientific calculators it can also be done by typing in the form of exponents, that is, 2.5x10^(6).
The exponents are added.