EvenQ
 Usage
• EvenQ[expr] gives True if expr is an even integer, and False otherwise.
Notes
• 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. • New in Version 1.
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