Unable to check multiple if else condition in JQuery

I am trying to check some multiple conditions in JQuery but it doesn't return the desired result. whatever I input it always went to else condition.

$(function() {
  $('#installment').on("keydown keyup", check);
  function check() {
    var inst = Number($("#installment").val());
    if (inst === 2 || inst === 4 || inst === 6 || inst === 12) {
      return true;
    } else {
      $("#installment").val('');
      alert("you can not set wrong value");
      return false;
    }
  }
});

<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<tr>
  <td>Number of Installment</td>
  <td><input type="text" name="installment" id="installment"></td>
</tr>