NO!!!!
It can be converted to a rational fraction.
Method.
Let P 0.6666....
& 10P = 6.6666....
Subtract
9P = 6.0 = 6
P = 6/9
P = 2/3
With Irrational Numbers you cannot convert to a fraction.
Casually an irrational number is one which goes to infinity, but the digits are not in any regular order. pi = 3.141592654.. is probably the most famous irrational number. Others being the square root (2) = 1.414213562....
and the square roots of prime numbers.
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No. A rational number is a number that either terminates or repeats. An irrational number neither terminates nor repeats. Therefore, it cannot be both.
If that's the complete number, then it's rational. But I see two periods after the '350'. Are those meant to suggest that the decimal goes on further ? If so, then in order to answer your question, we need to know whether the decimal ever ends or repeats. -- If it never ends or repeats, then it's an irrational number. -- If it ever ends or repeats, even if the repeat is several thousand digits long, then the number is rational.
There are an infinite number of values between 0.01 and 0.027 for example .011 .0111 .01111 .01111 .011111 etc. , .012, .0121, .0122, etc.
Integers are rational. Also, terminating decimal numbers, as well as repeating decimals (such as 3.12121212..., where "12" repeats over and over) are rational.
10101010 + 01111 = 10111001 (170+15 = 185)