It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 648 is not a prime number.
For example, 240 648 can be divided by 2: 240 648 / 2 = 120 324.
For 240 648 to be a prime number, it would have been required that 240 648 has only two divisors, i.e., itself and 1.
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240 648 is an even number, because it is evenly divisible by 2: 240 648 / 2 = 120 324.
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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 240 648 is about 490.559.
Thus, the square root of 240 648 is not an integer, and therefore 240 648 is not a square number.
The square of a number (here 240 648) is the result of the product of this number (240 648) by itself (i.e., 240 648 × 240 648); the square of 240 648 is sometimes called "raising 240 648 to the power 2", or "240 648 squared".
The square of 240 648 is 57 911 459 904 because 240 648 × 240 648 = 240 6482 = 57 911 459 904.
As a consequence, 240 648 is the square root of 57 911 459 904.
The multiples of 240 648 are all integers evenly divisible by 240 648, that is all numbers such that the remainder of the division by 240 648 is zero. There are infinitely many multiples of 240 648. The smallest multiples of 240 648 are: