I'm not familiar with either of your terms

"aparmey number" or "parimey symbel".

22/7 is a rational number because it is the ratio of
two integers, 22 and 7.

However p is an irrational number.

Compare them:

Look at 22/7

22/7 = 3.1428571428571428571428571428571428571428571428571428571428571428571428571428571428571428571428571428571428571428...

Notice that it repeats the block of digits "142857" over and over.
Rational numbers if divided out either terminate or they repeat a
block of digits forever.

Now look at p 

p = 
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132...

It doesn't repeat any block of digits forever.

Both those long decimals round to 3.142. Ppeople who don't 
need to be more accurate that the thousandths place can use 
22/7.  But machinists have to be more accurate than that, so 
they can't use 22/7 for p.

Edwin