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IsNumber

checks if the argument is a number
Syntax 

IsNumber(E:OBJECT):BOOL

Description
This function returns TRUE if E has type INT, RAT, or ZMOD. Otherwise, it returns FALSE.

Example 
  Use R ::= QQ[x,y];
  IsNumber(x+y);
FALSE
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  IsNumber(3);
TRUE
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  IsNumber(3%5);
TRUE
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