what does composite and prime mean and reciprocal

Prime is an integer greater than 1 that is divisible by the number itself and 1 only.

2,3,5,7 are primes.
A composite is a number that has other factors beside 1 and the number itself.
4,6,8,9 are composites.

Reciprocal of a number is the result obtained by dividing 1 with the number.
Example: The reciprocal of 3 is 1/3.