Entering exponents is done by pushing the key labeled [EXP] or [EE] or [EEX].
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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
Simple: Don't use a calculator. Just go to your Search bar and type, for instance, (5^3)^-6. The ^ key makes the number after it an exponent. Then... Google supplies the answer. :) It's easy.
You need a scientific calculator, or one with function keys.
Simply type in 2500000. In scientific calculators it can also be done by typing in the form of exponents, that is, 2.5x10^(6).