5625

Number
$5625$ (five thousand, six hundred and twenty-five) is:


 * $3^2 \times 5^4$


 * The $75$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $4096$, $4225$, $4356$, $4489$, $4624$, $4761$, $4900$, $5041$, $5184$, $5329$, $5476$
 * $5625 = 75 \times 75$