1). Quick check:
Any number that you can write down completely with digits is a rational number.
So yes, it is.
2). Formal analysis:
A rational number is a number that can be written as the ratio of two integers.
375 is the ratio of 375 to 1 ( 375/1 ) .
So yes, it is.
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yes
375 is not prime. 375 = 3 * 5 * 5 * 5
Yes.
yes
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.