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.
99 (= 11 x 9) is the largest multiple of 11 less than 100.
999milliom
It is 99
It is 64 which is also a square number
Any number squared except 0 is a perfect square so it follows that prime numbers are less common than perfect squares.
√1476 ≈ 38.419, so the largest perfect square less than 1476 would have to be 382, or 1444.
312 = 961
It is: 784 because 28*28 = 784
96.The largest multiple of 8 that is less than 100 is 96, 8*12.
99 (= 11 x 9) is the largest multiple of 11 less than 100.
To be a perfect square, all the primes in a number's prime factorisation must have an even power To be a perfect cube, all the primes in a number's prime factorisation must a power that is a multiple of 3 → To be a perfect square, all the primes in a number's prime factorisation must a power that is a multiple of 3 and a multiple of 2, ie the power must be a multiple of 6 The smallest prime is 2 2⁶ = 64 = (2³)² = 8² = (2²)³ = 4³ 2¹² = 4096 (too large) 3⁶ = 729 (too large) There is also 1 = 1² = 1³ Thus the whole numbers less than 100 which are both perfect squares and perfect cubes are 1 and 64.
3 is prime, 1 less than the perfect square of 4 (2x2)
5040 is not a perfect square. The greatest perfect square less than 5040 is 4900.
324
It is 25.
81 is the largest square of a whole number...
999milliom