It depends.
A terminating decimal is a rational number.
A decimal which, after a finite number of places, becomes a repeating (or recurrent) decimal is also a rational number.
A decimal that is not terminating, nor [eventually] settles into a recurring pattern is not a rational number.
Note that the decimal need not become recurring immediately.
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A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
A decimal need not be a rational. A non-terminating, non recurring decimal is an irrational number. Only a terminating decimal or a recurring decimal is rational and that is because such a number can be expressed as a ratio of two integers.
If its a rational number then its decimal equivalent can be expressed as a fraction
That is the definition of a rational number.
A rational number is a number that can eb expressed as a ratio of two numbers. 1/3 is a rational number, with a decimal representation of 0.333333 ... .