It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 742 is not a prime number.
For example, 420 742 can be divided by 2: 420 742 / 2 = 210 371.
For 420 742 to be a prime number, it would have been required that 420 742 has only two divisors, i.e., itself and 1.
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420 742 is an even number, because it is evenly divisible by 2: 420 742 / 2 = 210 371.
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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 420 742 is about 648.646.
Thus, the square root of 420 742 is not an integer, and therefore 420 742 is not a square number.
The square of a number (here 420 742) is the result of the product of this number (420 742) by itself (i.e., 420 742 × 420 742); the square of 420 742 is sometimes called "raising 420 742 to the power 2", or "420 742 squared".
The square of 420 742 is 177 023 830 564 because 420 742 × 420 742 = 420 7422 = 177 023 830 564.
As a consequence, 420 742 is the square root of 177 023 830 564.
The multiples of 420 742 are all integers evenly divisible by 420 742, that is all numbers such that the remainder of the division by 420 742 is zero. There are infinitely many multiples of 420 742. The smallest multiples of 420 742 are: