A two digit number has $5$ at its ones place. Will it be prime? Justify your answer.

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Solution

Any two digit number ending with $5$ can't be a prime number.
Prime number is defined as a number which is divisible by one and the number itself.
The number ending with $5$ is always divisible by $5$ , because the divisibility rule $5$ states that every number which has $0$ or $5$ at its unit place is divisible by $5$ .
So , two digit number ending with $5$ cannot be a prime number.

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