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use flip flop.
Please help me , thanks
Sounds like homework. One approach: build a state machine with five states (takes only three flip flops). Allocate the states so that they create the bit patterns for 0 to 4, but wire the outputs left shifted by one bit, creating the correct BCD patterns for 0,2,4,6, and 8
You'll need to be more specific: count the output from another circuit or generate the numbers? And what format BCD, Hex, binary.
If simply digital, then just trigger on the least significant digit, if that's a 0 then you have an even number...
Use a divide by four counter.
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Sorry, I meant a divide by eight counter, I'd use a divide by 16 counder because it's a common IC...