23 is an odd number.
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If the number is 23,512, the number is even. If the number is 23.512 the number is odd.
The sum of two odd numbers never makes an odd number. Only the sum of an odd number and an even number makes an odd number.
23 is divisible by 2. So it is an odd number
The difference of an odd number and an even number is an odd number.
An even number can be a multiple of an odd number OR an even number. An odd number cannot be a multiple of an even number.