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Just 1.
No...but 2.21 is the shortest answer out of many other answers....try 221/100
The foolproof way is to divide 4 into it. If the answer is a whole number, it's divisible by 4. You can also tell by looking at it. If the last two digits are a multiple of 4, like 24 or 80, the whole number is divisible by 4.
17 odd numbers.