It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 775 564 is not a prime number.
For example, 775 564 can be divided by 2: 775 564 / 2 = 387 782.
For 775 564 to be a prime number, it would have been required that 775 564 has only two divisors, i.e., itself and 1.
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775 564 is an even number, because it is evenly divisible by 2: 775 564 / 2 = 387 782.
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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 775 564 is about 880.661.
Thus, the square root of 775 564 is not an integer, and therefore 775 564 is not a square number.
The square of a number (here 775 564) is the result of the product of this number (775 564) by itself (i.e., 775 564 × 775 564); the square of 775 564 is sometimes called "raising 775 564 to the power 2", or "775 564 squared".
The square of 775 564 is 601 499 518 096 because 775 564 × 775 564 = 775 5642 = 601 499 518 096.
As a consequence, 775 564 is the square root of 601 499 518 096.
The multiples of 775 564 are all integers evenly divisible by 775 564, that is all numbers such that the remainder of the division by 775 564 is zero. There are infinitely many multiples of 775 564. The smallest multiples of 775 564 are: