isEven, isOdd, isNegative, isMaxValue, isMinValue, isInfinite, isPositive, isSingleValue.

lib/core/int.dart

Index: lib/core/int.dart
diff --git a/lib/core/int.dart b/lib/core/int.dart
index 2bc75be83d2739700b795860e3c3395015430f7a..9e3d5ec440f3816b7e01e7bafe9e24e1b3ef8208 100644
--- a/lib/core/int.dart
+++ b/lib/core/int.dart
@@ -36,10 +36,10 @@ abstract class int extends num {
   int operator >>(int shiftAmount);
 
   /** Returns true if and only if this integer is even. */
-  bool isEven();
+  bool get isEven;
 
   /** Returns true if and only if this integer is odd. */
-  bool isOdd();
+  bool get isOdd;
 
   /** Negate operator. Negating an integer produces an integer. */
   int operator -();