It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 242 is not a prime number.
For example, 800 242 can be divided by 2: 800 242 / 2 = 400 121.
For 800 242 to be a prime number, it would have been required that 800 242 has only two divisors, i.e., itself and 1.
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800 242 is an even number, because it is evenly divisible by 2: 800 242 / 2 = 400 121.
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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 800 242 is about 894.562.
Thus, the square root of 800 242 is not an integer, and therefore 800 242 is not a square number.
The square of a number (here 800 242) is the result of the product of this number (800 242) by itself (i.e., 800 242 × 800 242); the square of 800 242 is sometimes called "raising 800 242 to the power 2", or "800 242 squared".
The square of 800 242 is 640 387 258 564 because 800 242 × 800 242 = 800 2422 = 640 387 258 564.
As a consequence, 800 242 is the square root of 640 387 258 564.
The multiples of 800 242 are all integers evenly divisible by 800 242, that is all numbers such that the remainder of the division by 800 242 is zero. There are infinitely many multiples of 800 242. The smallest multiples of 800 242 are: