It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 401 is not a prime number.
For example, 42 401 can be divided by 109: 42 401 / 109 = 389.
For 42 401 to be a prime number, it would have been required that 42 401 has only two divisors, i.e., itself and 1.
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42 401 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 42 401 is about 205.915.
Thus, the square root of 42 401 is not an integer, and therefore 42 401 is not a square number.
The square of a number (here 42 401) is the result of the product of this number (42 401) by itself (i.e., 42 401 × 42 401); the square of 42 401 is sometimes called "raising 42 401 to the power 2", or "42 401 squared".
The square of 42 401 is 1 797 844 801 because 42 401 × 42 401 = 42 4012 = 1 797 844 801.
As a consequence, 42 401 is the square root of 1 797 844 801.
The multiples of 42 401 are all integers evenly divisible by 42 401, that is all numbers such that the remainder of the division by 42 401 is zero. There are infinitely many multiples of 42 401. The smallest multiples of 42 401 are: