It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 136 is not a prime number.
For example, 240 136 can be divided by 2: 240 136 / 2 = 120 068.
For 240 136 to be a prime number, it would have been required that 240 136 has only two divisors, i.e., itself and 1.
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240 136 is an even number, because it is evenly divisible by 2: 240 136 / 2 = 120 068.
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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 240 136 is about 490.037.
Thus, the square root of 240 136 is not an integer, and therefore 240 136 is not a square number.
The square of a number (here 240 136) is the result of the product of this number (240 136) by itself (i.e., 240 136 × 240 136); the square of 240 136 is sometimes called "raising 240 136 to the power 2", or "240 136 squared".
The square of 240 136 is 57 665 298 496 because 240 136 × 240 136 = 240 1362 = 57 665 298 496.
As a consequence, 240 136 is the square root of 57 665 298 496.
The multiples of 240 136 are all integers evenly divisible by 240 136, that is all numbers such that the remainder of the division by 240 136 is zero. There are infinitely many multiples of 240 136. The smallest multiples of 240 136 are: