It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 689 is not a prime number.
For example, 240 689 can be divided by 233: 240 689 / 233 = 1 033.
For 240 689 to be a prime number, it would have been required that 240 689 has only two divisors, i.e., itself and 1.
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240 689 is an odd number, because it is not evenly divisible by 2.
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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 240 689 is about 490.601.
Thus, the square root of 240 689 is not an integer, and therefore 240 689 is not a square number.
The square of a number (here 240 689) is the result of the product of this number (240 689) by itself (i.e., 240 689 × 240 689); the square of 240 689 is sometimes called "raising 240 689 to the power 2", or "240 689 squared".
The square of 240 689 is 57 931 194 721 because 240 689 × 240 689 = 240 6892 = 57 931 194 721.
As a consequence, 240 689 is the square root of 57 931 194 721.
The multiples of 240 689 are all integers evenly divisible by 240 689, that is all numbers such that the remainder of the division by 240 689 is zero. There are infinitely many multiples of 240 689. The smallest multiples of 240 689 are: