It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 564 is not a prime number.
For example, 842 564 can be divided by 2: 842 564 / 2 = 421 282.
For 842 564 to be a prime number, it would have been required that 842 564 has only two divisors, i.e., itself and 1.
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842 564 is an even number, because it is evenly divisible by 2: 842 564 / 2 = 421 282.
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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 842 564 is about 917.913.
Thus, the square root of 842 564 is not an integer, and therefore 842 564 is not a square number.
The square of a number (here 842 564) is the result of the product of this number (842 564) by itself (i.e., 842 564 × 842 564); the square of 842 564 is sometimes called "raising 842 564 to the power 2", or "842 564 squared".
The square of 842 564 is 709 914 094 096 because 842 564 × 842 564 = 842 5642 = 709 914 094 096.
As a consequence, 842 564 is the square root of 709 914 094 096.
The multiples of 842 564 are all integers evenly divisible by 842 564, that is all numbers such that the remainder of the division by 842 564 is zero. There are infinitely many multiples of 842 564. The smallest multiples of 842 564 are: