Select the whole row you want to change.
Go to Conditional Formatting.
For your condition, use "Formula Is" rather than "Cell Value Is".
Insert one of the following the formulas:
If you have the Analysis Tool Pak installed:
=IF(ISEVEN($A$1),0,1)
Alternatively:
If you want to check for odd whole numbers only:
=IF($A$1/2=TRUNC($A$1/2),0,1)
If you want to check if the integer of a decimal number is odd:
=IF(INT($A$1)/2=TRUNC(INT($A$1)/2),0,1)
If the number in cell A1 is odd, the format will be applied to the whole row.
If the number in A1 is even, the format will not be applied.