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5. Divisibility by 4

A whole number is divisible by \(4\) if and only if the last two digits are divisible by \(4.\)

Example: Which of \(716\) and \(406\) are divisible by 4?

Look at the last \(2\) digits to see if the numbers are divisible by \(4.\) The last \(2\) digits in \(716\) are \(16\) and \(4\) divides \(16\) so \(4\) divides \(716.\) The last \(2\) digits in \(406\) are \(06\) and \(4\) does not divide \(6\) so \(4\) does not divide \(406.\)

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