component.js

import React, { useState, useEffect } from "react";

const Component = ({ notifyEven }) => {
  const [value, setValue] = useState(0);

  useEffect(() => {
    if ((value % 2) === 0) {
      notifyEven(value);
    }
  }, [value]); 

  return (
    <button onClick={() => setValue(value + 1)}>Increment</button>
  );
};