I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.
Ask: How is ISODD and ISEVEN function used in VBA?
Solution: The issue is resolved. here is how you solved your issue:
Sub MacroTest()
Dim R_owe As Variant
Dim cur_row As Integer
Dim Val As Double
Dim ans As String
R_owe = 2
While R_owe < 15
If (WorksheetFunction.IsEven(Range(Cells(R_owe, 7), Cells(R_owe, 7)).Value)) _
Then
ans = "EVEN"
Else
ans = "Odd"
End If
Range(Cells(R_owe, 9), Cells(R_owe, 9)) = ans
R_owe = R_owe + 1
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.
Please don’t forget to Accept Answer and Yes for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members.
Thank You.