No it's not! What exactly are you doing with this number? Access is actually pretty forgiving about using a field that is all digits as number, even though they're typed as text. For instance, code like this will work, producing the correct results, if Me.FakeNumField looks like a number:
Private Sub Command2_Click()
If IsNumeric(Me.FakeNumField) Then
MsgBox Me.FakeNumField * Me.MultiplierField
End If
End Sub
If you run into a situation where it doesn't work, you can cast or coerce the text field to a numeric type by using such functions as CInt(), CDbl(), etc.