Yes they are, if they are large numbers. You do not need to count how many digits there are.
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1.5 × 10-3
Scientific notation produces convenient numbers when working with very small or very large quantities.
so that we can easy to know the measuring mass of an atom
It's best to convert those numbers from scientific notation to normal notation; that makes it easy to add them. After adding them, you can convert back to scientific notation if you want. Another option is to keep the numbers in scientific notation, but to convert them so that both have the same exponent.
Writing large or very small numbers in scientific notation helps prevent simple mistakes. For example, in physics or chemistry, the number of basic particles in one mole of a substance is Avogadro's number, which is 602214129000000000000000 or 6.02214129*1023 in scientific notation. In the expanded form it would be quite easy to miscount the number of zeros.