What does 3e6 mean on a calculator?

Answer 1

The "e" stands for "exponent" which means "×10 to the power of"

It is a computer's way of indicating scientific numbers.

3e6 = 3 ×10⁶

To convert to normal form:

3 ×10⁶ = 3 × 1,000,000 = 3,000,000