It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 538 718 is not a prime number.
For example, 538 718 can be divided by 2: 538 718 / 2 = 269 359.
For 538 718 to be a prime number, it would have been required that 538 718 has only two divisors, i.e., itself and 1.
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538 718 is an even number, because it is evenly divisible by 2: 538 718 / 2 = 269 359.
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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 538 718 is about 733.974.
Thus, the square root of 538 718 is not an integer, and therefore 538 718 is not a square number.
The square of a number (here 538 718) is the result of the product of this number (538 718) by itself (i.e., 538 718 × 538 718); the square of 538 718 is sometimes called "raising 538 718 to the power 2", or "538 718 squared".
The square of 538 718 is 290 217 083 524 because 538 718 × 538 718 = 538 7182 = 290 217 083 524.
As a consequence, 538 718 is the square root of 290 217 083 524.
The multiples of 538 718 are all integers evenly divisible by 538 718, that is all numbers such that the remainder of the division by 538 718 is zero. There are infinitely many multiples of 538 718. The smallest multiples of 538 718 are: