It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 402 is not a prime number.
For example, 842 402 can be divided by 2: 842 402 / 2 = 421 201.
For 842 402 to be a prime number, it would have been required that 842 402 has only two divisors, i.e., itself and 1.
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842 402 is an even number, because it is evenly divisible by 2: 842 402 / 2 = 421 201.
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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 842 402 is about 917.825.
Thus, the square root of 842 402 is not an integer, and therefore 842 402 is not a square number.
The square of a number (here 842 402) is the result of the product of this number (842 402) by itself (i.e., 842 402 × 842 402); the square of 842 402 is sometimes called "raising 842 402 to the power 2", or "842 402 squared".
The square of 842 402 is 709 641 129 604 because 842 402 × 842 402 = 842 4022 = 709 641 129 604.
As a consequence, 842 402 is the square root of 709 641 129 604.
The multiples of 842 402 are all integers evenly divisible by 842 402, that is all numbers such that the remainder of the division by 842 402 is zero. There are infinitely many multiples of 842 402. The smallest multiples of 842 402 are: