yes
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The number you've written in the question is a terminating number.
625 is not prime. 625 = 5 * 5 * 5 * 5
A terminating decimal is a rational number. A non-terminating, repeating decimal is a rational number. A non-terminating, non-repeating decimal is an irrational number.
625 = 6.25 × 102
Yes, it is. Any terminating or a non-terminating recurring decimal is a rational number. In this case, the decimal is terminated. And so, this number is a rational number.