No. As a general rule, multiples cannot be smaller than the number they are compared to. 9 is a factor of 225. 225 is a multiple of 9.
225
If it's to be a multiple of 9 the its digits must sum to a multiple of 9. Squares under 225 are 196,169,144,121,100... 144 ie 12 squared (and 9 x 16) would seem to be the figure you're looking for.
The least common multiple of the numbers 25 and 9 is 225.
225/7 is an irrational decimal, so 225 is not a multiple of 7.
The LCM is: 225225
1, 3, 5, 9, 15, 25, 45, 75, 225 (1 x 225, 3 x 75, 5 x 45, 9 x 25, 15 x 15).
The Least Common Multiple (LCM) for 375 225 is 1,125
The least common multiple of 35 and 225 is 1575
25
Least Common Multiple (LCM) for 168 225 is 12,600
The least common multiple of the numbers 165 and 225 is 2,475.
The least common multiple of the numbers 182 and 225 is 40,950.