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EvenQ
EvenQ[
expr
] gives True if expr is an even integer, and False otherwise.
EvenQ[
expr
] returns False unless expr is manifestly an even integer (i.e., has head Integer, and is even).
You can use EvenQ[
x
]
=
True to override the normal operation of EvenQ, and effectively define x to be an even integer.
See the Mathematica book: Section 2.3.5, Section 3.1.1.
See also: IntegerQ, OddQ, TrueQ.
Further Examples
This command forrces int1 to be even.
In[1]:= 
Out[1]= 
In[2]:= 
Out[2]= 
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