Yes.
All odd numbers end with one of the odd digits, namely one of: 1, 3, 5, 7, 9
All even numbers end with one of the other digits, namely one of: 0, 2, 4, 6, 8
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odd
An odd number times an odd number is an odd number no matter which 2 odds you multiply.
31 * 31 = 963 ■
If the last number is odd or even then the whole number is odd or even, in this case the last number is 3 which is an odd number, therefore the whole number is odd.
Odd