It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 842 401 is not a prime number.
For example, 842 401 can be divided by 7: 842 401 / 7 = 120 343.
For 842 401 to be a prime number, it would have been required that 842 401 has only two divisors, i.e., itself and 1.
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842 401 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 842 401 is about 917.824.
Thus, the square root of 842 401 is not an integer, and therefore 842 401 is not a square number.
The square of a number (here 842 401) is the result of the product of this number (842 401) by itself (i.e., 842 401 × 842 401); the square of 842 401 is sometimes called "raising 842 401 to the power 2", or "842 401 squared".
The square of 842 401 is 709 639 444 801 because 842 401 × 842 401 = 842 4012 = 709 639 444 801.
As a consequence, 842 401 is the square root of 709 639 444 801.
The multiples of 842 401 are all integers evenly divisible by 842 401, that is all numbers such that the remainder of the division by 842 401 is zero. There are infinitely many multiples of 842 401. The smallest multiples of 842 401 are: