Question 126913
N or the set of the natural numbers are the counting numbers you would use to count with (1,2,3,4,5,...). 
W or the set of whole numbers are the same as natural numbers but you also include 0 (0,1,2,3,4,5,...). 
Z or the set of integers are the set of natural numbers, together with zero and their negative counterparts and include (...-5,-4,-3,-2,-1,0,1,2,3,4,5,...). 
Q is the set of rational numbers that can be described as the ratio between two integers (examples are 1/2, 5/17, -2/3,...). Most repeating patterned numbers fall into this category.
I is the set of irrational numbers and every other number not in W, Z, or Q falls into this category. 
Examples are 
{{{pi}}} which approximates to 3.1415926
 {{{e}}} which is approximately 2.71828
 {{{sqrt(2)}}} which approximates to 1.4142135.
Your number falls into Q. 
It is the ratio of two integers.
In fact the two integers are 689 and 5247, 689/5247=0.13131313...