It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 289 is not a prime number.
For example, 842 289 can be divided by 3: 842 289 / 3 = 280 763.
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For 842 289 to be a prime number, it would have been required that 842 289 has only two divisors, i.e., itself and 1.
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842 289 is an odd number, because it is not evenly divisible by 2.
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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 842 289 is about 917.763.
Thus, the square root of 842 289 is not an integer, and therefore 842 289 is not a square number.
The square of a number (here 842 289) is the result of the product of this number (842 289) by itself (i.e., 842 289 × 842 289); the square of 842 289 is sometimes called "raising 842 289 to the power 2", or "842 289 squared".
The square of 842 289 is 709 450 759 521 because 842 289 × 842 289 = 842 2892 = 709 450 759 521.
As a consequence, 842 289 is the square root of 709 450 759 521.
The multiples of 842 289 are all integers evenly divisible by 842 289, that is all numbers such that the remainder of the division by 842 289 is zero. There are infinitely many multiples of 842 289. The smallest multiples of 842 289 are: