4225

Number
$4225$ (four thousand, two hundred and twenty-five) is:


 * $5^2 \times 13^2$


 * The $8$th square after $49$, $169$, $361$, $1225$, $1444$, $1681$, $3249$ whose decimal representation can be split into two parts which are each themselves square:
 * $4225 = 65^2$; $4 = 2^2$, $225 = 15^2$


 * The $65$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $3249$, $3364$, $3481$, $3600$, $3721$, $3844$, $3969$, $4096$:
 * $4225 = 65 \times 65$