It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 102 is not a prime number.
For example, 842 102 can be divided by 2: 842 102 / 2 = 421 051.
For 842 102 to be a prime number, it would have been required that 842 102 has only two divisors, i.e., itself and 1.
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842 102 is an even number, because it is evenly divisible by 2: 842 102 / 2 = 421 051.
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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 842 102 is about 917.661.
Thus, the square root of 842 102 is not an integer, and therefore 842 102 is not a square number.
The square of a number (here 842 102) is the result of the product of this number (842 102) by itself (i.e., 842 102 × 842 102); the square of 842 102 is sometimes called "raising 842 102 to the power 2", or "842 102 squared".
The square of 842 102 is 709 135 778 404 because 842 102 × 842 102 = 842 1022 = 709 135 778 404.
As a consequence, 842 102 is the square root of 709 135 778 404.
The multiples of 842 102 are all integers evenly divisible by 842 102, that is all numbers such that the remainder of the division by 842 102 is zero. There are infinitely many multiples of 842 102. The smallest multiples of 842 102 are: