Question
Is $51$ a prime number or not$?$

Answer

Here,
$51 = 1 \times 51$
$51 = 3 \times 17$
$51 = 17 \times 3$
$51 = 51 \times 1$
Since $51$ has four factors $1, 3, 17$, and $51.$ Therefore it is a composite number and not a prime number.

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