It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 144 is not a prime number.
For example, 165 144 can be divided by 2: 165 144 / 2 = 82 572.
For 165 144 to be a prime number, it would have been required that 165 144 has only two divisors, i.e., itself and 1.
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165 144 is an even number, because it is evenly divisible by 2: 165 144 / 2 = 82 572.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 165 144 is about 406.379.
Thus, the square root of 165 144 is not an integer, and therefore 165 144 is not a square number.
The square of a number (here 165 144) is the result of the product of this number (165 144) by itself (i.e., 165 144 × 165 144); the square of 165 144 is sometimes called "raising 165 144 to the power 2", or "165 144 squared".
The square of 165 144 is 27 272 540 736 because 165 144 × 165 144 = 165 1442 = 27 272 540 736.
As a consequence, 165 144 is the square root of 27 272 540 736.
The multiples of 165 144 are all integers evenly divisible by 165 144, that is all numbers such that the remainder of the division by 165 144 is zero. There are infinitely many multiples of 165 144. The smallest multiples of 165 144 are: