It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 242 is not a prime number.
For example, 842 242 can be divided by 2: 842 242 / 2 = 421 121.
For 842 242 to be a prime number, it would have been required that 842 242 has only two divisors, i.e., itself and 1.
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842 242 is an even number, because it is evenly divisible by 2: 842 242 / 2 = 421 121.
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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 842 242 is about 917.737.
Thus, the square root of 842 242 is not an integer, and therefore 842 242 is not a square number.
The square of a number (here 842 242) is the result of the product of this number (842 242) by itself (i.e., 842 242 × 842 242); the square of 842 242 is sometimes called "raising 842 242 to the power 2", or "842 242 squared".
The square of 842 242 is 709 371 586 564 because 842 242 × 842 242 = 842 2422 = 709 371 586 564.
As a consequence, 842 242 is the square root of 709 371 586 564.
The multiples of 842 242 are all integers evenly divisible by 842 242, that is all numbers such that the remainder of the division by 842 242 is zero. There are infinitely many multiples of 842 242. The smallest multiples of 842 242 are: