It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 426 is not a prime number.
For example, 240 426 can be divided by 2: 240 426 / 2 = 120 213.
For 240 426 to be a prime number, it would have been required that 240 426 has only two divisors, i.e., itself and 1.
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240 426 is an even number, because it is evenly divisible by 2: 240 426 / 2 = 120 213.
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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 240 426 is about 490.333.
Thus, the square root of 240 426 is not an integer, and therefore 240 426 is not a square number.
The square of a number (here 240 426) is the result of the product of this number (240 426) by itself (i.e., 240 426 × 240 426); the square of 240 426 is sometimes called "raising 240 426 to the power 2", or "240 426 squared".
The square of 240 426 is 57 804 661 476 because 240 426 × 240 426 = 240 4262 = 57 804 661 476.
As a consequence, 240 426 is the square root of 57 804 661 476.
The multiples of 240 426 are all integers evenly divisible by 240 426, that is all numbers such that the remainder of the division by 240 426 is zero. There are infinitely many multiples of 240 426. The smallest multiples of 240 426 are: